Don't remember if I healed or not. In the next room I would have certainly healed on the Fel Overseers. Now that they all are specced elemental, I two-shot non heroic elites so healing is rarely needed.
They each have something like 450 +dmg (so the same for +healing). The totems seem to be ticking for 35-37.
And you're almost correct. +healing gear gives 1/3 its value in +dmg.
All in all non heroic instances are very easy with this setup.