I'm assuming that you are using a glass tank? Might want to check out the sticky for setting up a glass tank if you did not already do so. I use tubs, so the humidity practically takes care of itself. When he is shedding like that you can soak him in some warm water. Be sure not to go too high with the water (about half way up his sides) after about 20-30 minutes place him on a towel or in a pillow case and let him slither through it. Most of the shed will probably come off for him then. Also make sure you are using a digital hygrometer to measure the humidity.....plastic dial ones are not reliable at all.