I have 10 hens and one rooster. They share a 12x11 coop, and a 30'x55' covered run. They generally get along well but not at bedtime. The coop has a 9' roosting pole about 18' off one (solid) wall. There's a multi level roost in the opposite corner, total of about 8' by a wall that lets them see out.
The like the long roost at bedtime, and ignore the one in the corner-- that's the one they like in the morning after it's light outside.
There's a group that sleeps really close together, on about 3' of the roost. The others spread out a bit once they are all settled in. My concern is the "settling in process". There's a pretty good bit of spatting/pecking that goes on while they all get situated. It seems to take 10 minutes of bickering and pecking before they settle in for the night. It's not one bully, and the rooster is not the problem. Most of those hens will peck sharply at their neighbor, for no particular reason. Sometimes the pecked hen moves, sometimes they just hunker down.
There's a little bit of mean girl behavior around food or treats-- but it's just dominance/pecking order stuff and there's enough room for the pecked hen to get away. Its the bedtime fighting I'd like to stop. Suggestions?