-Don't worry about programming in a night-time temperature drop. Keep ~88-90 hot side, ~80 cool side all day and night. Ambient in mid 80's is good.

-Ball pythons can tolerate a wide range of humidity. The Barker's point out that in burrows in the wild, people have measured humidity as high as 100%. The only problem with high humidity is bacteria/mold building up so watch out for that. But if you keep your enclosure clean it shouldn't be a problem. In the summer time my ambient humidity goes up as well, just keep things clean.

-Watch out for that Repti-Bark so your snake doesn't ingest it. Aspen, newspaper, and paper towels would be safer substrates.

-You should have two identical hide boxes, one on the cool side one on the hot side (so the snake has a choice, rather than being stuck in the middle).

Hope that helps,

JonV