About polearms and vampiric rage

hi everyone. i'm exping a toon (warsmith) for frist time with polearm and i'm finding it's behavior odd to logics:

- by one hand by swinging a polearm you can hit several targets in a frontal 45⺠cone (more or less)
- by the other hand vampiric rage buffs (or whatever new melodies and sonatas are called) have a chance of healing you back according to damage dealt to targets

the matter is when i hit several mobs while using a polearm i hardly get healed as like hitting a single target and this happens the same when using wild sweep and spinning slasher that are aoe skills (i know i'm hitting them all properly because flash effect from soulshots)

my question is if it is normal that vampiric rage seems to be capped when using polearm or if it is a bug.

thank you all.

 

i might be wrong, but it used to life steal from multiple enemies(long ago)? was it changed? or was it always single target?