my ball python (named him 'ka' from jungle book) is shedding, but i have an interesting problem that i can't seem to find anything about.

the skin on the belly half came off, and around the nose and tail, but on his back (about an inch on either side of his spine) the shed is just flaking off.

humidity is at 55% at the moment, but i live in michigan, so humidity is hard to control without an airtight case. (any suggestions)

ka does not seem to mind, but he is doing this wierd thing where he's trying to crawl around on the cieling of the cage. he'll brace himself with the corner, stand up, and try to slither around ont ehcieling of the cage until he falls over, then repeats for about an hour.

what's going on?