Ball Pythons like cramped spaces. It is surprising how they can squish their bodies into a cramped hide. Those hides look big enough to me. If you are worried about the hides being round, maybe cut them in half lengthwise. My BP burrows in the substrate to make more room in the hide. Just make sure if you have a UTH, that it is at 90 degrees because they will burrow down to the floor of your inclosure.