Are your healers having mana issues in most fights?Mana spring+mana tide+water enamored trinket thingy from the 2 shaman who have both the talent and the trinket. Other 3 shaman are MT group+2 dps groups.
Why do healers need shamans? Meager mana gains from mana spring?
Edit: Damn laptop keyboard
Even then, you can swap a shaman into the group for mana tide then swap it back out afterwards.
I didn't know shamans even used enamored water spirit ;\