If the birds are not feathering then I think you have a nutritional deficiency. We've had good success with the broilers from Meyers and never had feathering issues, even in the summer time with 4H birds.I bought 50 from Meyers Special last month and am very disappointed in the new cross they are selling. They arrived on 10/12 and because my brooder is in the house, started them on 19% game bird starter, not fermented, because of the humidity the FF produces. In 2 weeks, they went into the barn, since the daytime temps were in the 80's. I received all females, so I knew they would take a few weeks longer. I switched half of them to FF and half to wet feed and put ACV in their water. They are about 5 1/2 weeks now and still no feathers, except a few on their wings!
I never raised BALD chickens before. Now the night temps are falling, so a generator is running outside the barn, to light 2 heat lamps from dusk to dawn. Night temps fell to 32 degrees one night and we lost 8, but it's up into the 50's now, and I have about 350 other poultry in the barn, to add body heat also, at night. During the day, almost all the other birds free range, so it's just the CornishX cross in 10x10 pens inside the barn and a pair of 1 year old Cornish X cross from Ideal, that I am hoping to AI if the hen ever starts laying again. Plus a few laying hens that go in to lay in the nests during the day. I don't see any savings with the FF or any difference between the size of the birds on FF and the ones on the wet food, but what a mess with both, due to the extra humidity from the feeds being wet. The chicks have developed a decent frame, but are very skinny, being all butt and almost completely featherless. You can almost see all their internal organs through their skin. At the rate these "meaties" are growing, they will probably take 12 to 14 weeks to get to a decent fryer size. At 5 1/2 weeks they do not have any meat at all! I have grown a couple hundred meat birds over the years, so it's not my first rodeo. I had hatched out a batch of layer chicks a couple of weeks before I got these 'Meat" birds and the layer chicks are bigger and meatier than the Meyers "meat" birds. I will try to remember to take some pics at 6 weeks old on Friday.