The majority of priests have healed with base priest skills (regen, urgent, group heal) unmodified for most of the endgame content until the latest 60 and 70 elites. That said, maybe p/ch isn't as deft a healer as say p/s, but doesn't mean it won't be ineffective. In all actuality, looking at the elites now, I see they're pretty darn good to have in addition with the base skills. Perhaps all you need is practice.
To get rage while healing you have to learn to stand in melee range of the mob for your whitestrikes to hit it, which is how a lot of d/w get rage for their rage-heal. If you're solo-questing, when you tank hits, you gain rage as well.
If the combo doesn't suit your playstyle, consider switching to the opposite or picking up a third class so you can pick a new combo.