Roosters are a crap shoot. Some are darling, some are a nightmare, and some go from the darling to the nightmare in what seems like a second. The longer I am in the game, the more I am convinced that there really is no perfect way to raise a rooster. As in if you do this, and don't do that, you get a bird that is perfect.
I do think that roosters raised in a multi generational flock where there are hens that are older than them turn out better...kind of, sort of. All of my rotten roosters have come from flock mate only flocks. The cockerel gets bigger faster than the flock mate girls, sexually matures sooner than the pullets and becomes a bully.
Last year I introduced 2 8 week old cockerels to my mature flock, and seriously those hens took out a can of whoop ass and applied it frequently. Mrs. Feathers drug LongJohns around by the comb looking a lot like my 5th grade teacher taking a kid to the principal by the ear (you know, back in the old days). She adores him now, and he is a fair rooster.
THE BEST roosters you get with a sharp knife, as in you do not keep the rotten ones, and eventually you will get a really nice one.
Mrs K