I never meant to question your husbandry, or try to make you put your snake it a "tub". Just wanted to find any other reasons it might be wanting out.

If you have temps and humidity at the right place, all you need to do is look over your cage. Maybe the locks, though working, don't close the glass all the way? Maybe there is a hole or gap in the top?

They always try to get out, they want to explore...they're like kids: "I wonder if I can fit my head in this?"

Also, I would put your ball python back into the tank, I think I read that you're not going to because it will get out again, you don't want it to get sick though. You can always watch him/her and see where they're getting out.

Other than that though, good luck finding the problem.