First of all, and you might already know this so I apologize if you do, but ball pythons really aren't a good display snake. As long as they're happy and healthy, they hide 90% of the time and only come out for a few hours at night. They are still an awesome snake to have though!

Second, yup, it sounds like you have both of your probes in the right places. Sphagnum moss is really good at holding humidity, but you might have to dampen it before you put it in if your humidity is staying that low. It will evaporate pretty quickly. You could also try mixing in a little bit of a more compact, soil-type substrate like eco earth, cypress mulch or repti bark.

A black light heat bulb works just as well as an infrared, so it's really up to you on that one. Heat bulbs really kill humidity though, so I'm sure that's not helping. You might have to ditch it and move one of your UTHs to the cool side on another thermostat.

As far as the 2 UTHs, just out of curiosity, why do you have 2 for the hot side? Is that the only way you could get your temps up? Usually if people have 2 UTHs, they have one for the hot side and one turned even further down for the cool side. Your hot side temps do need to come up a little, along with your cool side temps, but yeah, when you get the floor temps sorted out, the ambient temps usually will work out as well.