Hello, no problem for the answer time, I'm not fast either.
It seems better for me now : I've invested in more life (to the point of having a 2000 points pool), life leech (Survival of the Cruel instead of Apocrypha and Elixir of Hunger in the Necromancer tree).
I can survive a lot more damages, specially when transforming back to the human form in the middle of the melee. And I no more get oneshoted.
For now it's ok, maybe I'll lack damages at some point, will see that later !
Have a good day