Good question and I feel your pain - Baby T is 7 months and he occasionally still poops in his cage but I think we have him on a pretty good schedule where he poops in the morning, at lunch, after dinner, and before bed. He still poops four times a day, which is a lot but it helps curb the messes in the crates. But yes, I feed him twice a day - and Linus too - and have always fed my bullies twice a day. I can see not wanting to because of the potty problems you're having but it really sounds like you might want to try to take them out for a short walk or something before bed to make sure they work that last poop of the night out before you crate them. Consistency in schedule, them understanding when it's time to go, and giving them some motivation (a short walk) will probably really help you out.