I wanted to add to this my set up..based on OPs. I did everything the same but added raise the dead obliterate, frost strike to my 2nd step hot bar ( my 2 step spams all the buttons on the 2nd bar ) anyway.. i was finally about to get my 86 DK to do 17-20 on the dummies. So its looking great.. now my trio of rog/fury war/frost dk are all doing 17-20k at 86! looking forward to 90 8)

As a note. i don't action bar swap.. i take that out of the macro and use my 2nd hotbar for the other macro and extra buttons i spam on the 2nd step.