Thanks for the advise. I've been playing my operative for a few days. Got back to the sorc and, no, I don't have force issues really, so I'll respec and go full corruption. Oddly, operative healing is fun but always makes me giddy, while sorc healing feels nice and comfy.
It's called "the bubble effect"
I get that all the time switching between healing as a sorc and healing as an op. The bubble gives you a few more seconds to heal your ally. Ops don't have that and that's the one thing I really miss when healing with an OP. Well, that and the awesome sorc AOE heal.
BUT, you do get much better energy management, a free heal, a heal that restores your energy and an "oh ****, I ran out of energy" skill, as an OP. Plus, you are more mobile.