I have noticed that my AM roosters are more aggressive in their duties to their girls. They definitely protect theri harem of girls. But are not a problem to me; I didn't raise them but bought them as youngsters.
On the other hand I have a speckled sussex rooster that is over protective at time and have many scars on my legs to witness his agressive strikes. However, among the 8 roosters I have from him, NONE are problem atic. Perhaps it is that I hand raised them. At 6 months or so of age no one is causing me any grief.
My point is, you could use the best roosters, raise up a LOT of chicks and select from the less aggressive boys.
A lot of stuff in the Boys comes from the Mom. It makes it hard to tell what you are going to get for behavior.