Put him in a sterilte tub about 6 inches high max for about an hour. Fill it up with barely luke warm water just deep enough to cover the snakes body. Remember what is warm to your touch is probably too warm for your snake. Put a dish towel in as well for him to rub against. Take him out after the hour and the stuck shed should come off. You might need to gently assist if the remaining shed is tattered.

Don't worry that he hates to soak. It won't hurt him.

How are you measuring the humidity?

Good luck!