I have yet to run into an issue where my Shamans pull aggro off my paladin tank, if your shamans are pulling aggro off the back with a chain lighting, may want to give them a paladin a second to make sure a tick of consencrate actuallys flys before doing a chain lightning, after waiting roughly 2 ticks, i have no Aggro issues at all, like Drizzit said, Paladin is EZ Mode