Casual cruising around the enclosure in the evenings is "normal". Cruising constantly, stretching to the top of the enclosure, constantly testing the top for ways to escape, even during the daytime, and never settling down is considered to be a stress indicator. On top of that - young ball pythons that refuse to eat week after week is a pretty good indicator that they are stressed. Combine the two - and some re-evaluations of the enclosure set-up need to be done to figure out why the animal is not settling into their hides and eating.
As to high humidity in tubs - add additional ventilation holes, and use a smaller water dish.