OK.. sorry.. I was just offering my advise...
If you have tried everything and can't find a solution and no one could help you in more than 60 posts, and you are sick of worrying about it..... then I guess you can't stop it = eat the chicken!
My experience is they feather pluck for 3 reasons....
1. Boredom.. being confined to a coop or run which is either too small or does not have enough stuff in it to stimulate their natural behaviours.. such as dust bathing. pecking at stuff, scratching in dirt etc.
2. Incorrect feed.. lack...