Try putting blessing of sacrifice on a clone that you think will get aggro. That way, when the clone gets hit it will transfer some of that damage to your tank and break the hex. Try to single target dps them down so that stoneclaw totems can tank adds until hex wears off the tank (in the event your blessing of sacrifice is on a clone that doesn't get hit). I don't know of much else to do besides burn the priests down quickly and keep them stunned/silenced as much as possible.