Get a pruby and craft blood axe, i had no trouble doing normal on p8 that way , halfway through act 5 i gambled a nice war axe with 71 %ed and ctc amplify damage, the only good thing was amplify, in nightmare i am using the same thing a gambled rare naga or you can craft a blood axe.
I also have a nice steeldriver maul i use againts boss on nigjtmare i upped it once and the damage is decent 3k zeal