if it makes you feel any better I am having a heck of a problem with feather plucking too, tried everything, no luck. Tried to put peepers on, they flipped out then so did I and took them off. I am going to stop all the treats and see if that helps, some say to many treats can lead to a protein deficiency, which can cause feather plucking. Mine are also fighting like I have never seen before, long cold winter and I have a very large coop, can't inagine if they were all in a small space. We need spring!!