I read your post & for what it's worth I have experianced exactly what you are in regards to the lack of back feathers. I have 8 Wyandotte hens & 1 rooster, I've had them all for about a year now, All of the hens at one time were without feathers on their back. Now, about half of them kind of have feathers but only 1 has regained most all of her feathers back. Initially I freaked out & ordered 8 of those hen saddles. They all wore them for months, but the feathers didn't come back so I took them off, I was then afraid the saddles were keeping the feathers from comming back. None of the chickens seem to care they are missing their feathers & I get anywhere from 4 - 8 eggs each & every day. If I get rid of these chickens & start over again, I will not have another Rooster. I like the Rooster, he is great, but extremely aggressive, my wife cannot enter the chicken run without him attempting to ambush her. The hens follow the Rooster around & he is extremely protective of them. He crows all of the time & as we are out in the country, this isn't a problem. I wish he wasn't as aggressive. Perhaps I will look into a less agressive bread. Regarding the lack of feathers, I am not a "chicken expert", but I wouldn't worry to much about the lack of feathers.