That is merely an example of the problem. The problem is, as the OP states, a general problem with enmity.So wait, your issue is your avatar can't hold hate off your melee hits?
It's not merely that my avatar can't hold hate from my hits, it's that an in game entity which is, reasonably speaking, far more powerful in every respect than i am cannot hold hate from my melee hits, even after doing significant damage to a target.
It's like a black mage auto-attacking with a staff and getting enmity over a samurai with a great katana.
Edit:Added quote for clarity