Air is a lot harder to heat than substrate, so it's going to have that problem if the enclosure isn't very well insulated and/or has too much airflow. The best solution would be to heat the room with a space heater to 75F so that the UTH and CHE have less work to do, if that is an option. If this is a traditional glass tank with screen lid, you can make some modifications to help it be better for ball pythons, but ideally you would go with something designed with this type of animal in mind. Some options are to place the entire tank in a shelf of some sort that can help retain a lot of the heat leaving from the back and sides, using some foam glued onto the back and sides, or using plexiglass pieces to reduce airflow at the top. There isn't going to be an setting on the herpstat that is going to give you correct ambient temps without the substrate being too hot if the enclosure itself is letting out too much heat.
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