At that age it is tough to say whether or not he will cam down as he matures. I keep my teenage cockerels separated from the pullets to avoid harassment. Is he your only Fav cockerel?
Yes he is the only Fav cockerel, I also have one Faverolles pullet and she is his polar opposite. Not neurotic at all, very calm and sweet. She will actually run to my chair and fly onto my lap when he is harassing her. They are the same age. I wanted to breed them, but if this is how he acts, I don't know if I can keep him let alone reproduce!
I can create a separation if necessary, I just hoped to keep them as one big unit for as long as I can, or until it becomes a problem.