Yeah, arms aggro is pretty rough I find. My strategy for heroics is to pick a real squishy target that isn't the tanks focus, and kill it myself. I usually pull aggro on it, but I use all that rage to pop Sweeping Strikes and Cleave. ^^ Healers don't always like it, I try to get a feel for how they can keep my up.
Sometimes I just wait a bit while the tank sorts out the pull.
I also keep my switch to Def Stance and equip Shield/1h macro pretty handy!