He's going to need probably an adult mouse. Not even the newest of hatchling ball pythons will bother with fuzzies, most get started on rat pinks or mouse hoppers. You're going to need to get a handle on that UTH and the humidity right away. Tanks are nearly impossible to keep humidity in. The lamp dimmer is a good idea. $12 or so bucks at any home improvement store and you've got a way to regulate your heat source. You'll have to keep a close eye on it even once it's dialed in, but as long as your house temps don't fluctuate too much, you should be able to dial it in and only check up on it every day.

Also, cluttered is good. But two hides is better. I would pick up a hide identical to the one you already have (if they have them) and ditch the log, at least for now.