I have three 18 wk old Barr Rock Pullets who want to roost in the nest boxes. I have 9 others who roost on the 2 roosting boards (2x4 turned on the 4" side). I put the roosting boards on the opposite side of the 8'x10' coop than the next boxes, and both of them are higher than the nest boxes. Does anyone have any ideas on how I can get the 3 pullets to quit roosting in the next boxes?