Couple of things:
First and foremost, stop bathing your snake. It doesn't need it, doesn't want it and it can have deleterious side effects. Just stop doing it.
Second, without a picture, no one is going to be able to do anything but give you guesses as to what's going on. Having said that - flaky, wrinkled belly scales with brown edging could be a bad sign, or it could be no sign at all.
In the meantime, stop changing things in the enclosure. Stop giving him baths. Stop adding hides, Stop removing hides. Don't put in a blue bowl, or a red bowl or a green bowl...leave the bowl alone. Dial all your parameters in and leave him alone. Be watchful and observant without bothering the animal. See if this is part of the shedding process, or see if his belly gets worse.