Hi Jake- thanks for your input. I'm uncertain as to whether you keep any ball pythons in cages and, if you don't, I'm not certain that you would be able to notice any differences!
As for the snakes rarely leaving their curled up position, I have to say that all of my snakes in tubs and in cages all leave their curled up position each evening/night to cruise around their environment. I have noticed that the snakes in cages lounge around outside of their hides a lot during the evening/twilight hours while the snakes in tubs are limited in their activity due to space.
I have 5 snakes right now who are all over 1100g and in 32qt tubs. Given their size and the tub size, they have little choice but to lay in their pee. It is interesting that you have observed differently. And again, my larger snakes in 3x2x1 cages never lay in their pee.
It is evident that there is so much still to learn about these snakes and I really value these sorts of discussions.
Thanks for the input and take care.