Against priests I'd use the glyphed stoneclaw shield, and grounding totems. And make a purge button for all shamans, and purge their shields and buffs away. When it comes to rogues and ferals I'd use thunderstorm on round robin with 1 shaman specced into 100 % chance to root the opponent with earthbind totem, so when you press thunderstorm you also put down a earthbind totem. Get pvp trinket, and use that to get out of their opening stuns. Then thunderstorm and earthbind em, you could use frost shock aswell after that to buy some time to heal up your team.