play like enhance ? and what build is 20 in holy are you suggesting ? is it 20 holy rest ret or prot ?
When GahzāRilla, in ZF, punts you, and someone else doesnāt get punted, it drops agro. Iām not sure if it completely dumps all threat or if itās just a static amount but I definitely see him switch to other people the moment he punts me.
When Princess in Maraudon fears me, and someone else doesnāt get feared, she switches to them and doesnāt automatically come back to me when I come out of fear. Itās easy to taunt her and get her back because Iām a warrior but I donāt know if it would be as easy for a Paladin.
You can go 20 holy / 31 Ret, or 21 holy /30 ret if you not planning pvp. 21 holy compare to 31 holy , you only lose holy shock and 5 % crit, you can even raid heal as ret / holy. That is you have a decent healing set, any armor type
There is too many point required for a proct / holy built to work . I wouldnāt bother with proct unless they introduce duelspec
those are two I have tanked and seen drop aggro! good examples!
the one time on princess I threw out the immune bubble on the dps to try get her back, it stopped the dps getting attacked but didnāt pick princess back up until she died, I really forget the specifics.
on the ST dragon, I bubbled the healer the dragon started attacking a dps , but soon as the bubble ran out dragon switched immediately back to the healer, this happened twice, in hindsight it maybe better to pre-bubble/cancel to dodge the sleep but idk if it would work.
cant dispel the sleep
There are loads of threat drops, especially from trash mobs.
Most mechanics that root or incapacitate the player will also provide a degree of aggro drop. BRD trash is notorious for it, Hooked Net, multiple stuns, disarms, silences make tanking a lot of it a real pain.
Blessing of salv is your friend
Trash mobs are fairly inconsequential in Classic 5 mans so long as people follow kill orders, or simply exercise common sense.
Apart from maybe the ZF hydra as the poster above suggested, there does not seem to be a boss in 5 mans that actually resets threat on the main threat generator.
Perhaps somebody has definitive examples? I have only done two instances since I came back to WoW.
I gotta ask op : Did you have consecration, and, were you downranking?
Aggro drops are not a problem, just use blessing of protection on the target, drop a consecration, and youāre good. This should also be talented down to 3 minutes. Also, were you putting Salvation on everyone else in group?
I donāt mean to insult your intelligence but I have had more or less the opposite experience as you. Only thing I canāt pick up is if a priest Mind Control pulls (Iāve seen this happen).
You will have a much easier time spamming dungeons as a tank than a healer. Youāll get to 60 with much better gear and more quickly. Healers are about 10x more common than tanks.
Warrior threat in dungeons is very frustrating at times too.
We have to get hit, and hit targets, in order to generate rage so we can generate more threat.
But when the DPS jump out of the gate with their big crits, they not only pull the mob off of us, so weāre not generating rage by being hit, they also pull it away from us, so we canāt hit it to generate rage lol.
Regarding healing as prot, I wouldnāt do it, if youāre gonna heal, go all in, holy has some amazing talents for healing.
Itās kinda a shame to see a pally tank give up right before gear becomes available to do it 
once you get to scholo thereās a set called deathbone, its the best paladin tanking set untill BWL tier 2, it gives you tons of defense and mp5.
As for the mana issues, I would use consecration top rank, and seal of wisdom, just the seal dont judge it as it costs too much mana to keep judging, as well as the fastest weapon you can get. The beautiful part of seal of wisdom is that there isnāt a internal CD/ proc rate, so the faster you hit the target, the better chance at getting mana back (I use this as a healer if I oom)
As for threat drops, thereās really nothing you can do, except go deep holy and use divine favor (100% crit) and holy shock as a taunt, but even that doesnāt do much some times. For some reason bosses dump aggro on a target if they kick them in the air or stun them, not sure if its a bug or not, I donāt remember it from back in vanilla.
Mutanous, Twilight Lord Kelris, Mograine and Whitemane, Amnennar the Coldbringer, Princess Theradras, Shade of Eranikus, Antuāsul, and Chief Ukorz Sandscalp are notable ones through the levelling process although Iām sure Iāve probably missed some.
My forum toon level is not up to date. I have tanked 2/3 of these, Iām lv. 45. Iām genuinely puzzled. I only lost aggro for like, 1.5 seconds when Iād get punted by Ghaz, f.e. Iām honestly not sure what caused the op to have the kind of trouble s/he described.
log out and back in to update your toon, my profile said i was level 25, when i was 60 haha
Could just be a playstyle difference? Not having mana after the threat drop or having judgement on cd or something?
It might not be too big of an issye when done right but itās certainly more hassle than pressing taunt lol.
cant dispel the sleep
you know, I originally put āonce it falls offā but edited it to put dispelled because  thought it sounded more correct my mistake 
Most mechanics that root or incapacitate the player will also provide a degree of aggro drop
roots even do that if the target they choose to attack is still within range of the tank though one autoswing usually seems to get aggro back in that case.
Blessing of salv is your friend
yeah I get it, as tank I am putting salv on everyone, sometimes they are asking for other buffs but it still wonāt stop a determined dps pulling I guess.
I have had more or less the opposite experience as you
so you run seal of wisdom, consecrate rank 1 never run out of mana, never have to drink and the dps never pull aggro? the deam  (I joke)
 (I joke)
at 52 I had a rogue around the same level as me sword spec when he hit his dps cooldowns and started nuking a mob I hadnāt even had chance to touch there was nothing I could do to get aggro back short of BOP him and I didnāt feel like begin yelled at.
I have to ether constantly drink or pull on maybe 20% mana and all that is worth is a couple of seals and a max rank consec
Lvl 50 is when you can really start doing some decent things as a protection paladin. Mana does come into play but, spend 1g before you go out on the lvl 60 water. My rotation for a pull is: Make sure you open with ret aura on, pop your holy sheild before charging in, mark a skull for the nubs, then just walk in drop a conc. Paladins really do hold aggro great. Try again at 60 if you wish and practice. Ive had no issues and once i respeced back to Ret i really saw how good paladin tanks were.
youāll see more agro drop / knock back type mechanics once youāre 50+.
While holding eggrolls can be frustrating, you just gotta roll with the fallacy that is paladin tanks.
Respecāing holy only provides 1 major benefit - free mana heals on crit - and 5% holy crit to accompany that.
Iām 31/20 holy prot ā i prefer to heal, but iāve tanked every single endgame dungeon with this talent build.
There are some fights were you just simply lose agro based on mechanics - donāt get frustrated by it. Every group iāve done just uses their class abilities to accommodate the lack of taunt. (fade, vanish, iceblock, etc coupled with bop).
Itās literally no big deal. Donāt get discouraged.
Fyi, I started end game dungeons healing, slowly built the tanking set, then because of lack of tanks, began to tank some. Got it down like a well-oiled machine now.
Last thing to note - holy shock is amazing for agro.
I really enjoyed tanking and plan to go back to it @51 when I can have consecrate and holy shield. 44 or something I respecced for Holy Shield to see what I was missing and had a blast doing some aoe farming, but it was still so painfully slow to 2h kill stuff as prot, so I decided to go 31 holy then down the ret tree.
2h dps for soloing with a deep holy/dip into ret build in an int set is about 50% more damage than 2h soloing deep prot (judge crusader,SoR judge on CD, Holy Fire) and I can still throw on a shield/1hander and aoe groups down with ease. You take a bit more damage, but have the mana and no interrupt heals to deal with it no problem.