When i had my 4.5' girl in a T10, she ate like a champ. Then i poached the T10 for my retic and gave the BP a T8. She ate poorly in that. I got my retic and boas T25s and gave the T10 back to my BP and she has gone back to eating like a champ, coming out and 'playing' at night and now has gone into shed.
I dont know if it was the cage size or just the a coincidence of the time of year when i switched caging but there was definitely a change in eating and behavior between the T8 and T10.