I have multiple roosters too. You have 3. I said when you have 2 roosters people often have problems with one attacking or even killing the other.
Not all roosters mate hens the same. Many favor only a few easy hens. Having plenty of hens is recommended, but it can work with less. Every...
Often 2 roosters will focus on each other. I never recommend 2 roosters. Either 1 or more than 2 to keep the fighting down.
I would suggest you pick one or rotate them out. You will need 25-30 hens to not see a lot of mating wear. If your birds are confined to a run you definitely don't want 2...
I have lots of different breeds. Buff Orpingtons tend to be an even tempered breed. Not too dominant and not too meek. So pick what appeals to you. Think about things like how productive you need them to be. Whether you want different colored eggs, or what colors or patterns appeal to you. I...
Thanks for the tag but @junebuggena knows genetics better. I say get different colored hens and see what you get. I like my buff Orpingtons, but I also enjoy other breeds in the mix for variety.
Comb color is dictated by health and whether they are laying and sexually receptive. When comb color is faded it indicates they are out of lay or aren't feeling well. Combs are a visual clue for other chickens.
If your layer pellets are 16% protein as most are than I would switch to something with higher protein or cut out the extras that lower the overall daily protein. Layer and treats don't work together well. I recommend a ration with 18-22% protein. Also try adding some higher protein treats like...
I personally would wait and see how they get along before rehoming any, unless you really need to keep less. They can be hard to tell apart especially as chicks. Things like comb shape can help to tell them apart, and personality too, but you may need to wait until they mature a bit.
I agree with the question about a rooster. How old is she? Chickens are starting to look pretty ratty this time of year, and the molt isn't far off, I have a little rooster who has started to molt already. So feathers are getting older and more brittle on birds older than a year.