Looking at your roost, I suspect they were all trying to crowd onto the middle rung of the ladder. Even if they were using 2 rungs, that is only a little over 6 1/2 inches per bird. I have some girls that like to crowd into each other, but some of them try to sleep as far away from any others...
A few weeks before you think they will start laying, place some fake eggs or golf balls in the nest boxes. Your girls should start investigating the nest boxes a couple of weeks before they are ready to lay. The fake eggs will show them that the nest boxes are the proper place for eggs. You...
8 weeks old is still a little young to expect them to always go reliably into the coop at night. At that age, they can be like stubborn little kids. I would keep shoving them into the coop at night until they get it. It could be their personalities too. My flock seems to go in their coops in...