I suggest removing sharpshooters from the instance. They keep jumping backwards and both Rytlock and Canach follow them. They always end up chasing them into sentries a good ways away from me.
Either that, or removing Ryt and Canach.
Edit: They just ran away from me again, this time it wasn't a sharpthooter. Just one of those surfer guys. Death #... I think 5? This would be way more fun if I could kill Rytlock and Cabbage myself. Just let me kill them at the start and rez Cabbage when I need a door open.