Can you try this stuff (It's what I use for shedding) http://www.petsmart.com/product/inde...ductId=2753947 Once the shed is over, I remove the moss.
I soak a decent amount in a bowl of water, then ring out most (not all of the water) and put it in with the hide that is over my UTH, this creates a nice humidity box and the shed should come off in a day or two. Also here is this thread that might help. http://ball-pythons.net/forums/showt...hed-No-problem
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I just saw this post, try with the moss inside verse outside, put it in hide that is over the UTH.