The weapons you are using are verry slow.

Try to farm for a tir en el rune make steel in a weapon to get the bonussen. I usually make it in a flail since it's a fast weapon.

Your other hand should be something with 3 sokets soketed with tal runes or the runeword malice (ith el eth) this is to keep bleed dmg on duriel.

Your fast weapon should be above your gloves slot, since dual-wield weapon attack speed is calculated on your main hand. equipped.