I actually play PLD with a BRD over voip and we time bursts together to down healers due to Full Swing being the healer killer. Killing multiple healer groups isn't hard but man it takes a ton of coordination and in a pug alliance that's almost impossible to get.

Also just get off the point when you see a WHM on the point use Equanimity. They'll just holy nonstop most of the time and blow their MP and their cooldown for no reason. Save Glory Slash and Wither for when you see Medica II go off so you can stop the flow of regens as well. Since the healers tend to bunch together on the point to dickride each other you can usually dispel 2-3 targets at a time.