What types of pvp are we talking about here. BG ?

well, nothing gonna be good if you have to heal yourself all the time. The heals are more like "I kill a bunch people, then recover my health quickly so I can go again" kinda the heal. Not "I stop dpsing and constantly healing myself while they beat on me" heal.

With 4 accounts, you need a dedicated healer follow you around. And best do 4 dps killing rather than one healer + 3 dps.

4 shamans still good. Use healing surge. Should get better with shamans before moving onto other muti class combos.