@Willowpaw - Your best bet is to fight them using your brains instead of brawn. Don't just run into the group and start attacking. You want to avoid that AOE they have, that they generally open up with. So you jump in and out real quick and go hide behind something so they come up around you. Then your RTTC is fueled, you missed the huge defense debuffs and you can take them out. I suggest dropping the smaller ones first.
@Deus_Otiosus - The reason SM is so powerful at mitigating opponents is the Fault, Tremor, Seismic Smash combo. My Ice/Stone tank doesn't have to many problems with Cims unless they're +3 or higher. I can knock them on the ground about every 10 seconds or so. And Seismic Smash the healer to hold and or kill him.