I'm also not a fan of "to high" humidity with Ball Pythons, esp. if that means they sit on wet (or moist) substrate. I only keep it higher or moist to the touch during the shed cycle. Moist and warm breeds bacteria quickly.
I do mist almost every day, but its just in an area between the dry/cool ends, so that the snake can still choose where to hang out, without having to choose wet substrate in order to thermo regulate or "hide".
My display cage still has a mix of Reptile Prime and Repti Chips. I like that for the cage, because it holds humidity longer. That's why I wish you could buy the chips dry and in smaller quantities. I don't want to buy a block and store the expanded chips, just to mix soem with other substrate for one single cage..