wafak, you can just straight tank the Butcher with those stats

Wiz resistance is weaker then character like Barbarian or Monk.

e.g your 500 physical resistance could only mean 30%+ damage reduction while Melee character like Barbarian and Monk will be getting around 40%-50% damage reduction with the same 500 physical resistance.

As usual if you always get one shot, especially as a wiz you have no choice but to pump up for a higher HP.

what is your armor value?

seems act 2 mostly die from regular melee attacks