I've pushed my VIT up really high (70ish) and it seems that around 60 I stopped getting any HP bonus at all. is this working as intended?
It very well could be. SE has used diminishing returns equations in the past. Or perhaps physical level plays into the equation too. That could explain the drop in HP:
Physical level 1-10, HP = VIT*5 +X
Physical level 11-20, HP = VIT*4 +X
So dinging from 10 to 11 would actually lower your HP. Edited, Oct 4th 2010 9:40am by Hydragyrum