Hello and welcome to the forum!
I am wondering if you know what your enclosure's ambient (air) temperature is because that is also important to monitor and can affect the temperature of the substrate.
There is no need to worry about the belly heat temperature on top of the substrate because your BP will burrow down for more warmth if he needs it. As long as your hot spot temperature on the floor of the enclosure, under all the substrate, is between 86-92F, it's all good. I would suggest switching back to Eco Earth as that is a good choice for a substrate and great for humidity.
If you've decided to keep your BP on towels, which is also a workable substrate, you can try keeping humidity up by adding a bigger water bowl, or more water bowls, and by misting the enclosure regularly. It also helps to add some damp sphagnum moss under your BP's hides when they are in shed, or create a humidity box (tutorial here: https://www.youtube.com/watch?v=kS8gZXXK7S4) for your snake to choose to use himself as needed. Overall using Eco Earth would probably be less work though so I'd recommend that.
Good luck and I hope your BP's shed goes well!
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