Aggro Issues for BrM

When we are doing Normal mode ToT I find myself doing great dps but having an issue with aggro and the other tanks and sometimes I take aggro at the wrong time. The problem with this is that I am just auto attacking on the phases that they are tanking. It's just frustrating.
Should I just cancel aura vengeance?
Any Help would be appreciated thanks!


Armory: http://us.battle.net/wow/en/characte...konbrew/simple