Yeah, I've found the same thing with my Kenya and my finger leather. My Kenya was looking fine for weeks, then I brought it into work to put in my nano, and it took almost 2 weeks to fully recover from the hour is sat in a bag. Temperamental!
I've done the same with a piece of GSP, and it's been in there for a week, and so far only about 1/4 of the polyps have come back to life. These corals really try our patience!
Back to the question of fragging - if you cut a branch, what's the best way to get it to attach to something? I've been known to use the skewer method for mushrooms and other softies, but Kenya's have a pretty tough skin, so I don't know about the skewering.