BP poop can get quite smelly, especially if your housing provides good conditions (heat, and humidity)...makes wonderful smells. Consistency is what you need to watch, if it's like water for more than one passing, then you should be concerned.

Reptibark is high in dust I find, and if your ball python had trouble eating (had to remove bark from mouth) at all, even if it's not a lot, then I'd consider switching. Aspen works well.

Hope this helps.