What kind of thermometers are you using? I'm guessing you have those round analog thermometers? If so, get rid of them. They aren't accurate enough for the purposes of monitoring your ball pythons temperatures. Get a couple digital thermometers with probes and put one under the substrate over the UTH, and one on your cool end, opposite of the UTH, on the surface of the substrate.

I'm sorry you didn't make it here sooner so you could figure out all the things you would actually need. I made the same mistakes with my first snake. Found out I bought a bunch of crap I didn't need. :/