Another thing to try, find a BLM friend, who can sleep I forget which level but they get a trait that AOE sleeps everything, (that can be slep) this will help a lot on the trash. A healer can sleep, but its one at a time, and usually with a tank that is taking a lot of damage we don't have time to sleep any mobs beyond the first one.

P.S. BLM will love you if you queue up with them, eliminates most of the DPS wait time in the duty finder lol