Just a try => unlearn skills you don't need for this battle and pop them into the Shaman Mage Hammer spell (lvl 4 needs 200 mana). This stuns the opponent and kills the summoned. Are you sure, you have no skill pts left?
I killed Mr X with hammer at 4 and no skills in my axe at all (lvl 29).
Charms, click hereA way to increase acc indirectly is using gold charms - please, look, which stats does this.