Start with your AoE moves so they are off cooldown sooner. Make sure your dps knows to give you a small lead, and mark mobs. You don't need a complete kill order, but burning down one mob first should give you the lead you need in threat.Another thing, I am having MAJOR problems with AOE tanking, I just can't seem to get the threat out to keep the mobs. I normally Devastate the first one for about 2x stacks of sunder, then thunder clap/shockwave/cleave. What else can I really do?
(It also prevents people from single-targeting different mobs.)