Casper, give them a nice wide roost. Like 2 inches wide. Adult large size fowl should have a 4 inch wide roost. When they are young, they shouldn't be roosting with their keels hitting the bar. It can cause them to have a crooked keel ( bent cartilage). Also for large fowl the roost should be no higher them 12 to 18 inches off the ground. That way they will not injure a leg or ankle when jumping down.
Years ago a lady got sick and could not care for her Speckled Sussex any more so I took them. She also had Guinea hens. She had put her roosts 5 feet high for the Guineas. The Sussex were also using that roost. This one poor old hen was so crippled and deformed in her feet from the injuries caused by flying up and down from that high roost she could hardy walk. It was pitiful to see her hobbling around the yard trying to do chicken stuff. She was only 5 yrs. old. Her shanks and feet looked like a 90 yr. old with severe arthritis. It was so sad. She was such a sweet hen.
Best Success,
Karen