You might have to look on a chicken hatchery web side for "skirts" for your EE's or whatever they are called. It will protect them & help in the loss of their feathers.. Or let the free range more often.. Do you have chicken math?? They do need to be able to get away from a bully..
Yeah, I have heard that guineas can be mean to chickens.. They are not as domesticated, that is why they will eventually leave your property after a year or so..
Called hen saddles or hen or chicken aprons. I have them on my EEs and they do free range but that Golden Cuckoo Marans rooster is pretty quick in the morning! I got mine on ebay from a lady named Cathy, I think if you search for hen saddles you'll come up with a few hits. Hers stay on my girls, they're very well made. I bought some from a chicken supply site & kept finding them in the grass instead of on the girls.