I always advise that 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 more problems are likely. The only reason you need a rooster is for fertile eggs. Everything else is personal preference. It sounds like your personal preference is to have one.
While it is possible, depending mostly on the individual personality of the roosters and especially how much room you have, to keep two roosters and seven hens together, I fully support your decision to get rid of one. The feed store is a good idea. You can also advertise a free rooster on Craigslist if you wish. People sometimes have the same problems with barebacked hens and over-mated hens when they have one rooster with over 20 hens that they can have with two roosters and seven hens, but with the 2 and 7 those problems are more likely.
A big problem is that they are not yet hens and roosters, they are pullets and cockerels. Mature chickens act a lot differently than adolescents. If it hasn’t already it can get really wild in the coop and run when those hormones get out of control. Since your goal is one rooster I think getting rid of one of them is a great idea.