My CAG is a picker. I've tried, sprays, vets, aloe, bathing, you name it. The only thing I havent tried is the collar. I've heard that the collar will keep them from picking but when you take it off they go right back to picking. I think it's alot like biting your fingernails. It's also a way to deal with stress. Mostly it's seperation anxiety stress. Anyway over the years I've just come to accept it and love my bird all the same with or without feathers but there will always be a part of me that wants to curve this behavior. Keep trying, maybe with enough minds working together we can figure this thing out.