Farmed more... once I leveled to 57 I started finding more gear that was better than what I already had, and I bought a couple of things... then I changed my build to give me some more armor buffs. Now I have about 6,000 armor with passives, and almost 9,000 armor in battle. 74% reduction in damage. Working really well.
With three weapon changes since I hit 57 I now deal 8,100 dps. I'm not sure how some demon hunters and barbarians are doing 30-40k dps. I guess we will see once I hit 60 and fill out with level 60 gear.