"Did you notice changes of any sort as you were healing, similar to this that didn't make sense at the time but turned out to be positive?"
Oh yeah. Lots. Looking back many good steps along the way that weren't obvious at the time.
As for the twitiching, it sounds roughly the same. I've always had it a little (so did my Dad), and it always seemed to be when chilling out. Or, sometimes for my Dad when he had coffee, and was gearing up I guess.
I would not worry about this one - it seems harmless, and it's almost a nice thing. A true tangible bit of becoming calmer.