As the previous replies mentioned, the Ceramic Bulbs suck the humidity out of the air but according to your gauge, the humidity levels seem fine. You should get a second humidity gauge to verify the accuracy of it. You don't need an expensive one for this, just something to verify your results.
If humidity is correct, I wouldn't do anything just yet in terms of changing the heat source. Soak the Ball Python in warm water for a while to help it get any of the stuck shed off. It should peel right off after a warm bath. I would then wait for the next shed to see if it comes off in one piece. If humidity is too low, try change the bulb, spray down the enclosure a bit and keep a closer eye on the humidity with a different gauge.
Hope this helps.
Liam.
Reptile Range.
P.S. Love how you decorated the enclosure.