I'm at my wit's end. Nothing I do seems to make a difference. Organic ACV in their water, nutridrench, jalapenos, 22% feed, 16% feed, more feed pans, 11 gallons of water, greens, grit. Always oyster shells.
We got two new hens in July, and my daughter suggested separating them into our mini coop that's in the run to see if that makes a difference. That and adding a timed light in the coop are my last resorts. They definitely molted hard in July, though. Our rooster still has pin feathers. He's almost 5. He's separate, fwiw.