I think stuff like that wouldn't help.
Like with humans you have nailbiters, and stuff that makes the nails taste nasty, even thought they will keep biting their nails.
Look intough the animal. 80% of Pluckers have behavioural problems. (unshure of theirselves)
The rest could come by wrong feeding.
You say it happens in the springtime. In nature in the springtime there are a lot of diffirent fruits to provide the birds with the right vitamins. Provide the bird with a lot of different fruits..
Biting feathers also has to do with changing feathers.. Some bird do not change their feathers in the right amount of time, feathers stay in longer than they supposed to, they can itch and be ennoying, so the birds try to remove them by there selves...
Try to find out what cauzes the problem, and try to fix it in a natural way instead of collars or sprays.....
(i have heard stories that someone used it and it only became worse