While I do agree that treating with pine tar is addressing the symptoms, I also know from personal experience that feather picking/plucking can be a learned behavior. Removing the true culprit is definitely best, if you can identify her/him. And using the pine tar worked for me in discouraging the behavior and breaking the "habit" - it can also help prevent the issue from becoming cannibalism, which is definitely a valid concern. But I will say that I believe the true "cure" was that I began letting mine free range from sun up until sun down. Addressing any over crowding issue and/or boredom issues is absolutely necessary.
Covering the run is completely up to you. My concern would be the hawk issue you mentioned. If you know there are hawks in the area, penning your chickens with no over head protection is likely going to set them up as a smorgasbord. But it's completely up to you to access the risk and make that decision.
It sounds like you are doing a great job. I wish you the very best of luck. Let us know how it goes.
Take care,
Penny
Covering the run is completely up to you. My concern would be the hawk issue you mentioned. If you know there are hawks in the area, penning your chickens with no over head protection is likely going to set them up as a smorgasbord. But it's completely up to you to access the risk and make that decision.
It sounds like you are doing a great job. I wish you the very best of luck. Let us know how it goes.
Take care,
Penny