Well, my flock is still on Forco. I have twenty now, and I'm ordering the ten-pound bucket. It saves some money. They are addicted to the stuff, and I still believe it helps them absorb more nutrients.
They're all molting, even the four-month old pullets and cockerel. I noticed one pullet standing over her mate, systematically yanking feathers off her back. I gave her a sharp "peck" with my pecking finger and she hasn't done it again that I've been able to notice.
When those pin feathers are coming in, they're very vulnerable to picking, and the pickers quickly develop an addiction to them. What I do is keep them painted with Blu-kote so there's no color showing but the Blu-kote. It also helps heal damaged skin and prevents infection. Yinzer, you might try that.
My four Sussex are all chronic feather-pickers still, and I'm alternating between the peepers and bits to keep them under some control. Flo is still a problem unless she's wearing peepers. I tried to put a bumpa-bit on her but it wouldn't fit properly for some weird reason. She may be developing scar tissue inside her nostrils where the prongs fit. The peepers fit okay, though, and seem to be keeping her habit under control.
There is no cure for this curse. All we can do is try to minimize it somehow. It will come and go as the flock endures periodic stresses. I just enjoy the periods where everyone is sporting a full set of feathers!