I'm a level 30 scoundrel.
I'm usually the top healer in every warzone and I have successfully healed every flashpoint so far.
I also quest sufficiently as sawbones and complete quests in a fair amount of time.
Stop complaining because you are stubborn to learn a new class. You don't really become an effective healer until level 30 because you get your free heal that only uses upper hand.
It all comes down to energy management, if you spam without any concern, what do you expect?