Again I tell you to read FAQs on Dios. There are two about assassins.

Blind first. If there are other, not enemies and you can harm them (mobs as well) then dirt. Dirt on dwarves should be good (not sure, though)

Dont spam in battle, so you could get your weapon if you been disarmed

Dont kote unarmed opponents, there is no sense in this. Kote is an improved version of disarm, in general. But here it gives you almost nothing.

Your HP is very low, maybe you are an elf/drow or you just have poor gear. Dont know.

You should beat dwarf hand spec without any problems in your midranks, I think. More experienced with warriorlike classes will tell you more, I think.

And about sacrificing weapons - why not? You are his enemy, should he let you get it and kill him?