Seeing a ball python drink is pretty rare! What a lucky sight!
As for the temps, I would invest in some digital probe thermometers. Those dial ones are hard to read for a reason, they are crappy. The digital that you have 1 inch off the ground, is it the flukers one? If so, that one is good for measuring humidity and ambient temperatures, so you are doing okay with the ambients (or cool side).
The best advice I can give you for right now is to place the digital thermometer right on the glass above the UTH. If the temp is around 90 (but less than 95) you should be fine with your temps. But first thing tomorrow, go out and get a thermometer with a probe and a light dimmer for your UTH (which is probably too hot).