Smart Feeder - Light sensor values

[art12345]

i have a little flock of chickens started with three and it has grown to six over the last few years. They all get on well together we did intos slowly and carefully. They have plenty of room are allowed out frequently have treats, dust and soil baths the lot. I am a very happy chicken mummy with one exception, Meggy Moo Poo the japanese bantam an original hates the other chickens with beards including my sultan (who is a lot bigger)and by little blue silkie and has been plucking and eating the feathers. Nowhere else just beards.i realise this is her asserting her dominance and they do not seem distrbed by it just stand and let her really.

I want to make her stop. I have tried anti pluck spray with little effect. Is this because it has to be sprayed really regulary ie several times a day? Has anyone used any other methods successfully? I cant bumper bit her as she is too tiny and they dont make them that small.