That and cut out the scratch. Most layer is 16% protein and about the minimum needed to produce eggs. It is also intended to be the sole ration. Adding scratch can dramatically reduce the total protein intake.Ditto Dat!
Feathers are unlikely to grow back until a molt.
Feed a higher protein(18-20%) feed than layer feed.
The pictures look like the beginning of cannibalism. I've had that in younger birds when I cut out the fishmeal I was adding to their organic grower. In doing so, the protein dropped from 20% to 16%. They were missing the amino acids and after eating feathers, they started eating meat in front of the tail. At first I thought I had rats till I caught them in the act.
BOSS is too high in fiber. Digesting that fiber will use up the extra protein afforded by the seed so won't really satisfy the protein requirement.