Are they using the middle roost? How far from the walls are the other two?It still doesn't make sense to me since I only have 6. I have 3 roosts and they choose only 1. I had 4 roosts but took one out to space them out more. There is plenty of room for them to spread out at night, if they wanted. And, plenty of room in the runs.
Often, coops like yours have four 3' roosts across the short dimension of the coop. Mathematically, that gives 12' of roost space but it doesn't allow for clearance. They need roughly 12" for their back ends on one side and for their front ends on the other. That is another rule of thumb, so it holds true most of the time. Large breeds may need more. Individuals may not mind squishing or may tolerate it if it is enough better than alternatives. (half of my flock tolerated much less clearance to use to beam at the top of the wall in order to roost so much higher).
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