Do not cull. This group is very fast to cull roosters. Roosters are chickens also, and culling should be the last resort and frankly, I don't think it ever needs to be done unless a rooster is suffering with pain. Roosters are way more complex than hens and have so much more to be responsible for. Roosters react when they are scared. They are responsible for so much, to protect, to feed to lead, and to mate. Yet, some want to cull them for doing their jobs - some roosters are immature and need some love training. Try this method. It has worked for many BYC members. Don't try any of the pin them down methods.
https://www.thefeatherbrain.com/blog/taming-aggressive-roosters
https://www.thefeatherbrain.com/blog/taming-aggressive-roosters