When my young girls moved into their new coop, they loved the roost. For comfort, I put in the one from the brooder too and they used both. NOw weeks later, the girls are crowding on the flat roof of a crated hen ( only layer so she gets her own food and space) and are avoiding the roosts. Not another hen can fit on the flat roof and the other birds are squeezing on to the roost supports. Only a few 3-4 are on the roosts. What am I missing?? I tried putting on their red heat lamp--a few moved on to the roosts. I'm stumped. Any thoughts????