Please be advised that excess humidity can be as detrimental to snake wellbeing as scarce humidity. Taken from the BP care sheet:

"50%-60%
60%-70% during a shed cycle

Providing the proper humidity required by your Ball python is important in maintaining good health and non-problematic sheds. Both excessive and inadequate humidity levels can lead to illness in the form of respiratory infections and a very damp environment easily lends itself to the growth of mold and fungus which can contribute bacterial or fungal infections, scale or belly rot."

Try installing a heat bulb or ceramic heating bulb to pull some of the humidity out.