Ok, try putting him in a rubber maid with a damp towel, with good ventilation (holes all around the rubbermaid). I put one towel, folded, and heavily misted the towel, put the snake in there, and fold the towel in half over the snake, if he wants to come out from the towel he will. Put the rubbermaid in his enclosure, just incase he does get out, if it's a big enough rubber maid put one end over a little part of the heating pad.
I did it with my little female and she came out a perfect shed, when they usually have bad sheds, old skin stuck, and eye caps....good luck....