What to feed?

[nuthatched]

I have the pinless peepers on them now, but it's not stopping it either.

Hmm. If possible, focus on expanding their area, separating the instigators might knock them down a peg.

 

[Perris]

@ellchr3 you might find this site useful:
https://www.featherwel.org/featherwel/

"FeatherWel aims to provide advice on practical strategies to reduce the risk of injurious pecking occuring in non-cage laying hens during both the rearing and the laying periods. The evidence for these strategies is based upon scientific evidence, experience from industry and the results of the Bristol Pecking Project. This website briefly summarises key management strategies."