I'm pretty sure that it's your math that is wrong. 24 birds in an 8x4 coop equates to less than 1.5 sq ft per bird. The average sized chicken takes up a single sq foot just standing still. If it chooses to flap it's wings, that's 3 to 4 sq ft. That means you should have a minimum of 4 sq ft per adult bird, more if they are very large breeds. Overcrowding stress is serious, and often overlooked by first time chicken keepers. It causes all sorts of issues from poor production to extreme cannibalism. That's right, they can get so desperate for space that they kill and eat each other. That's why commercial birds are debeaked. And if it's raining or windy, the birds aren't going to be out much. In winter, that means they could be spending days on end crammed into that coop. 8 birds max.