I have eight feet of roost pole for 11 chickens, and there is always three feet empty. Seven huddle together on the last three feet next to the south window, and the other four huddle together on the last two feet next to the north window. At least, that's the way I find them just after dark. The poop board indicates that they spread out some during the night, but I still think that there is no shortage of roosting space.
As to the rooster that flogs you, that's a different problem that I would want to solve if he were mine. I had a couple of pullets that wanted to roost on the poop board, but after I put them up on the pole about four nights in a row, they decided they liked it.