Hmmm, odd. You've got better gear than I do and you're doing less damage. The only thing that jumps out is strength vs agility. I'd expect to see your strength in the 1100+ range and your agility <300. In the end you've got a lot more crit, but less AP. Take a look at some of your strong agility items and see if you can swap in strength/AP items like ruthlessness (ring) circle of death (ring). Beserker on the axe is also the way to go.