I have 2 young KSBs and while their great eaters normally, they do occasionally refuse a meal. But other than when I first brought them home (they refused to eat for a few weeks), they typically only miss one meal and resume feeding the next time. My snakes' skin always looks oddly wrinkly right before they're about to shed, too. I don't know how you keep your enclosure, but I keep mine in a tub with aspen shavings as a substrate and a water bowl large enough for them to soak in (although I've never seen them use it). I noticed they kept having stuck shed, too, until I added in something for them to rub against to remove the shed. May have been coincidence (they shed a couple of times with no problems without the added rocks), but it might be worth a try in addition to the humid hide.