It looks to me like your roosting bars are too small (diameter), and too close to the floor. See the second set of pics posted above --- those tree branches are more like the right size, about the diameter of a small child's arm. Also, I'd find a way to make a ramp up to the bars (even just another long branch), and space the branches/roosts apart so it's more like a slanted ladder they can walk up instead of a vertical jump/fly up to the roosting bars. I have about 35 hens and 3 roosters at the moment. Those at the 'top' of the pecking order like the high roosts. They'll hop from bar to bar, or walk up the slanted bars on the sides, to reach the best spot. I have about 6 bars, spaced about 14-18" apart, and each one about 12" higher than the last. Lowest bar is 12" off the floor. My birds *never* use the two lowest bars, except to jump to the next one up. If I had your coop, I'd take that slanted cover over the nesting boxes and lay it flat (poop board), then install a roosting bar down the full length of your coop, several inches above the poop board. Make a series of shorter bars, like a slanted ladder, in the end of your coop so they can easily hop/climb up to the high bar. You can use trays or whatever on the poop board to make cleanup easier.