If you put the chanter on slows, the shaman can concentrate on healing... and then add the mage for more dps out of those 3 (a rogue would be better but hey). He can dish out some nice weps for the chanter charmed pet too
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Druid ports aren't hard to find, the DS doesn't add much really for its recast time in a group like that. If you added a 5th I'd add a 2nd healer of some sort.