Easter Egger beard feather picking

I realize there are a ton of articles and threads about feather picking, but I’m wondering specifically about picking Easter Egger beard feathers. Both of my Easter Eggers have lost all their beard feathers under their beaks. I first noticed it on the darker colored one after being gone during Christmas. I started investigating and found no evidence of mites or lice so I suspected feather picking due to cold weather boredom, a lower protein layer food and stress. I recently added a new hen, who is doing great and integrating well, but obviously caused an uproar in their little community.

Last night while locking them up, I noticed the white EE trying to wipe her neck on the roosting bar. After scooping her up and taking a look, I discovered a good portion of her beard feathers missing as well. Again, I don’t see any evidence of mites or lice and they seem very healthy otherwise.

I switched to a higher protein feed, added a flock block (big hit!) and have been hanging apples to keep them occupied. I also added some features to their run to help with the boredom. This seemed to help a few weeks ago with the first gal, but now the other one has a naked neck. Any ideas from folks with EEs?

 

Hmm, no roos here as we live in town. No other missing feathers as far as I can tell. I'm also hoping warmer weather (feels like April!) and some distractions will help.