There are no rules to roosters. Just try this or that and recognize if it does or doesn't work.
Removing all of the roosters will dramatically drop the tension immediately. Most people do not recognize the tension until it is gone, but then it is very noticeable. That will affect how the...
You do need to change what you have going to practice good animal husbandry. At 14 weeks, there really is no point in even considering how your cockerels are acting, as how they act today, is no indicator how they will act tomorrow. And if you remove some or even one of the roosters - that will...