Leigaon and Dement have good points. I'm opening my trash pulls with Berserk + Overpower twice and Infuriate for Steel Cyclone. Abuse Berserk, it has low cooldown and you can have it available every pull

After opening, use Storm's Eye combo for extra damage and distribute your aggro combo through enemies: Heavy Swing and Skull Sunder one target, Butcher's Block another target. This way, you can build a bit of aggro on each of them to stop the DPS from generating enough to get attention. Repeat until monsters are dead