What type of substrate are you using. Substrates such as aspen help hold humidity in. You could also make a humid hide. When it is shedding time for my BP I add a humid hide filled with damp Sphagnum moss. By watching the humidity levels and using a humid hide, I have not had a bad shed with my BP. When snakes shed they rub against somthing to help start the shed. Are you using a hydrometer to monitor the humidity?