Sounds like you need a few more feeders, and a higher protein feed.One feather-picked area is on the rear. When my hens eat, a few certain chickens go under them and jump to get a good bite of the plumage. In order to eat, a hen has to jump up a foot and half onto a board. Another area is the chest. When a couple of my hens sit by each other, one will study the other's chest and pull on her feathers there. The last area is the back, right above her tail. When they mingle around, the bullies will run after a calm hen and peck her back.
I have a large run outside. We give them stuff to pick at and stuff. They have a lot of room and are not overcrowded.
My neighbor had mites in his coop, and it's definitely not that in my case.
The feed is in crumble form. It has 16% protein in it, and other essential nutrients/vitamins. Should I feed them more protein? I have a feeling it's the feed, or lack of supplements. Could I get anything in a block at the store, or something to put in their water?
The peepers sound okay. But what if they run into a wall, or fly up and hit something and get injured? I don't know about them.
They do eat feathers lying around, and I suspected that was harmless. But they just pounce on each other, and start hammering!
This picture is one hen who is really mellow and gets picked on the most. She grew her feathers back during molting, so her wings and upper back aren't bald. But the areas I described are bald. Others look like her current condition.
Now I won't do the beak trimming. Thanks for all advice and feedback. Very much appreciated!!!