If dps outgear you by a lot, keeping hate can get hard. A few things that might help

-Mark targets. Or at least mark the initial target. If people want to ignore that mark, they can just tank whatever themselves.
-Noone else pulls. Initial agro helps you get all the critters in range for flash or overpower without them running all over.
-Tell people that if they get hate, they should run TO the tank. Trying to save the dps in the back running around in circles will just make you lose hate from the rest of things.
-Shield Lob at the start is your friend to get some quick hate.
-Some DPS are actually quite capable with dealing trash mobs themselves. Sometimes it's just faster and safer to let them tank it, especially if they are geared.