Annihilation 1: Ironfur as much as you can, 2x is normally fine.
Annihilation 2: Ironfur + Barkskin
Annihilation 3: Ironfur + Survival Instincts
Annihilation 4: Ironfur + Barkskin +Survival Instincts
Always iron fur as much as you can before he hits you. You can also delay his cast by grabbing an orb. You dont need to spend rage on maul. At least I didnt.