That's a lot of birds pooping in the coop over night. How often you cleaning under the roosts? Poop build up can cause ammonia toxicity...I end up cleaning mine out 1 time a week.
Before I have 2 plywood’s each side and whit 2 2x4 and clean every week and smallest a lot really bad ,now I do this and no small try to build campus I spreading diatomaceous heart on top of poop every 3 days is ok or not , this is the second week