Agree with most of these comments. But a few remarks,
Decrease dmg per second from 14/24/36 to 12/20/30: it seems too much to me, maybe 12/22/32. I agree that immolation is a bit strong, but not to need a 20% decrease in damage. I think these numbers are more reasonable. But this is one of those changes you have to test and let meta settle before you can tell for sure.
Arcane Tower is already powerful enough: I would disagree that Arcane is powerful enough (at least if u compare it with UD towers or cemented ORC towers), it is decent enough XD. But HU does need some better base defence, that is for sure. Maybe consider giving the town hall a garrison capacity for peons and/or make towers build next to the hall stronger than regular towers (and this can be better with keep and castle). That would help HU without making tower pushes stronger. It may also incentive more the 1 base play. Dont know if it can be implemented though.
The value of the item will drop a lot, especially in comparison to the circlet: I tend to agree. But I would not mind seeing this change tested in 1.36. If it is too much, it can be reverted. At the moment is almost always the best item. I think that +4 claws may still be the best or second-best item in some situations/for some heroes. That would imply that the item was not nerfed into the ground. This would mean it is not one of the best items, which is not necessarily bad.
Besides these changes, I still would like to see Lich nerfed as a 1st hero. It is crazy strong as a late-game hero (I’m ok with that), but then it should not be that good as a 1st hero. Maybe decrease its movement speed a little or nerf its starting attributes a bit. Alternatively, change the range of nova to match (for example) entangle. I also think either UD natural defences should be nerfed or its fast expo should be nerfed. To have an unattackable base made sense back in the day when UD was not able to expand, but this situation has been reverted.
I would also like changes that allow a wider variety of 1st hero choices, like DL or Pala. Not MK, that is a super-strong hero in the late game, and should not be a regular 1st hero. This can be achieved by tweaking some starting attributes and/or movement speed, which can have a massive impact on the early game but does not affect the late game much.
ps: If some UD players keep complaining about weak ghouls and not having clarity. Can always give that race footmans instead of ghouls and acos the ability to harvest lumber (but just 10 at a time!) and the human shop instead of the UD shop (so say goodbye to skeletons, a good orc and scrolls of healing).
ps2: agree with ag3nt, don’t be afraid of overbuffing humans. We already had the kotg patch, the CL patch, the FS&hh patch. I wouldn’t mind having stormbolt stun during a ridiculous amount of time or having WE slow enemies with their attacks