Has he actually shed or not yet?

If he has shed, this is how to fix a bad shed:

http://ball-pythons.net/forums/showt...hed-No-problem

If he has not actually shed yet, I would not continue soaking him. I would just raise the humidity level for now.

Don't get an analog humidity device to measure it...they seem to be relatively inaccurate. Instead, get an electronic one. Bonus is it should do both temp and humidity levels.

Something like one of these should do well for you:
http://www.amazon.com/AcuRite-00325-.../dp/B004K8RF10
http://www.walmart.com/ip/Acu-Rite-I...mometer/896347