We have one beautiful EE who is the smallest girl who is getting her head picked on constantly. We've tried the Blukote but it's not working. She is also the one the others try and keep from the feeder or prevent her from taking treats on the floor - they will run across the run and coop to keep her from food - She still fights back and gets in the nest box laying the most beautiful blue eggs, - but what can we do to help her poor purple head - some posts say coal tar - others say l “Rooster Booster, Pick-No-More Lotion”. Any recommendations? pros and cons?