You are just gimping to group by dps-ing in heal-spec. It IS a douche thing to do. Field respec is basically free, get it and learn the dps-specs. :P Your damage amounts to absolutely nothing in heal-spec and your resource pool just goes down the drain.
Too bad, the game allows me to do it, so I do it. If you don't like to it try and stop me. I do just fine in flashpoints. :P