On a warrior primary? Devastating Hammer is what you want.
I second that stonefists + 7 adrenaline for devastating or stonefistes do jack + 10 adrenaline for back breaker
I only use backbreaker for my r/w hammer as no stonefists and itt adds some damage still get 4 second KD + with the right mix of expertise I use for great justice and tigers fury for a total cost of 8 energy instead of 20