Essense regain on single target - blood surge

Anyone not using the new Ult and having issues with Essence managemnt on Boss fights using blood surge as their main attack?

Im having massive essense probs even tho I have spec’d into resournce gen and invested into cost reduction.
I have essense gain from healing and blood surge heals me alot as I have 120%Healing

Essense is not an issue anywhere else in any other content other than boss fights.
as soon as I get into fighting a boss in the pit i just instantly lose all my essence.
I have chance to gain primary resource as well which has a masterwork roll on it (although the masterwork wasnt intended) and my lucky hit is at 90%

but still im having to stop multiple times to generate on a boss fight or smash pots to regain essense during the fight which sees me losing a lot of buffs/damage that need to be stacked.

EDIT: Okay so something is def up, just did a nightmare T4 and no issues with boss what so ever with resources also went to duriel again no issues with resources whats so ever, went back into Pit 70 and instantly lost my resource at the start of the fight and continued to endlessly run out.

Im starting to think that PIT bosses are not giving the right amount of healing from when blood surge is used.
I run Starlight aspect on my ammy. where I gain 60 resourse for every 20% I heal or every 120% I over heal at full health… and my healing is at 120.2% thats not taking into account my resource Gen which is at 61.6% and 15.5% resource cost reduction.

also streamed for my friend to show him the difference ofver discord and he agrees that something is not right.