I’m not one to believe in magic numbers for chickens. There are lots of people that don’t come close to the 10 to 1 ratio and do fine, but your ratio is way out of bounds even for me. If roosters are going to fight, it doesn’t matter if it’s over one hen or thirty. The ratio doesn’t have anything to do with fighting.
There are people that have over 20 hens with one rooster and still have some hens over-mated or barebacked. Breeders often keep one rooster with one or two hens the entire breeding season and do not have over-mating or barebacked problems. One of the breeder’s keys though is that they use adult hens and roosters, not adolescent pullets and cockerels. It sounds like yours are still pretty young. Things might get pretty exciting son down there soon.
I always suggest you keep as few roosters as you can and still meet your goals. That’s not because you are guaranteed problems with more roosters, just that it is more likely. With your 4 to 3, I’d say it is as close to definite as you can get when dealing with living animals. You have said you don’t want to get rid of any so what can you do?
The only realistic answer I can come up with is build a bachelor pad. House three or maybe all four males in there with no females to fight over. They usually get along if they don’t have any females to fight over.
You can try to leave things as they are and see how it goes, but I’d strongly suggest building a separate accommodation for them so you can react quickly if you need to.
