Have the same problem and the linked thread is offering different ideas. ...get a cup o coffee and snuggle in for a while...
https://www.backyardchickens.com/t/697052/i-think-i-found-a-miracle-cure-for-feather-picking
https://www.backyardchickens.com/t/697052/i-think-i-found-a-miracle-cure-for-feather-picking