Generally speaking, you are asking for a lot of trouble with that many roosters in a smaller flock, and probably a limited area. If this is your first time with chickens, and you are raising your first chicks and now realize that you have 4 roosters, I would strongly recommend getting rid of all the roosters. That many will run your hens ragged.
Roosters take experience, and in my opinion, roosters raised with just flock mates tend to become bullies very early. All those hormonal driven tendencies will make them more aggressive to the pullets, more aggressive to each other, and often towards people too. They tend to attack children first, then women and finally men.
Roosters are a crap shoot, some can become very aggressive, really hard to believe if you have not seen them. People without experience often times do not recognize the signs of an imminent attack. This forum is full of posts where the darling became the nightmare in an instant.
Personally, I have a father/son in a group of 15 hens. I am hoping to get to summer and then cull the old rooster. At this time, the juvenile rooster, is low man on the pecking order, and that is good for him. Ideally, I will cull the old boy before the new boy attacks him. It will take careful daily assessment.
To have 4 roosters, I would want 50-60 hens and a great deal of space. If yours is a true backyard set up, I would recommend no roosters. If you have young children, I would recommend no roosters. If you are determined to keep all of them, I would recommend a separate bachelors quarters away from your hens.
Mrs K
Mrs. K and Pork Pie said everything I was thinking.Cock birds do not mate equally with all hens. The more superior in the hierarchy the hen is - the less she will accept being mated. The result can be over-mated subordinate hens.
I agree with Mrs. K and forget cockbirds and enjoy your flock for the time being. The more experience you have before keeping cocks, the better your chances of having a positive experience once you take the plunge, imo.