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The beard and muff damage I'd expect. The missing feathers on top is more unexpected. I'd up the protein for starters, more like 18-20%, as 16% is considered minimum for most breeds.

Any photos of the damage? Is the bird being pecked bearded and muffed? It's not unusual for muffed birds to get their facial feathers groomed off by others, it's not the same thing as feather picking in the traditional sense.