I was working on an argument for Vampiric Link,
But first I would have to disagree with you on VE.
VE is a healing skill, so you'd have to compare it to the scaling of other healing skills, not the health pool.
currently, heals increase by a factor of 153% of spell power.
(
http://www.resto4life.com/2008/09/01...-coefficients/)
VE (if you have Imp VE) gets 5*25% = 125%.
So I don't think VE would be OP considering it doesn't scale as well as other heals.
If you are going to nerf VE because it scales better than health pools, then you would have to nerf all heals too.