Are you sure you don't have a "cannibel" chicken? How many do you have and how big of an area. If they're crowded they can get to pecking on each other badly. I don't know what else to suggest.
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They don't need the starter anymore. How much scratch? I think I'd cut that out entirely for right now. Being too fat can cause some issues, do you think they're over weight? If you've got them under lights I'd quit that also.