I have two roosters with seven hens. I had the same problems, with the same concerns. Mine did grow out of it. Your cockerels are still young, with raging hormones. I do not like getting this advice, and I despise giving it, but let them work it out on their own. Step in when necessary, but let the big guy put his brother in his place. Mine are thriving. They will be two years old in April, and there is a sense of peace within my flock. The boys still tangle every once in a while, one of them usually ends up bleeding, but they are fine and they seem to forget their fight pretty quick. And because I did not listen to others about butchering my EE roo, I now have two wonderful protectors for my flock that like to gang up against any and all threats. My EE roo became a momma's boy, until my Sapphire Gem roo lost his spur last Friday. I was trying to spray the wound and the EE swiftly tried to take me down because I was cornering his big 'brother'. So yes, it is doable to have two roosters that were raised together live in relative harmony within a small flock. It takes work, patience, and no small amount of pulling out your hair trying to figure out how to quell the fighting once their spurs grow in. But it is doable.
I apologize if I rambled or got side-tracked. I am currently enjoying watching my EE try to clean off the coop ramp.
