Do you think maybe your cats are stressed out? I'm not a vet, nor do I have any cats, but I have spent a lot of time with birds, and one of the first tell tale signs of stress is they start losing their feathers. That many changes to a diet would be more than enough to create some havoc, and maybe the balding is their body's way of reacting. Are this strictly indoor cats? A very dry environment could be causing the flaking, something very prone when it is winter, as the heater dries up air significantly.
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Calling from deep in the heart, from where the eyes can't see and the ears can't hear, from where the mountain trails end and only love can go... ~~~ Three Rivers Hare Krishna
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