Interesting subject. I would almost bet, like you stated, that the crow is a hormonal thing. The louder the crow, the higher up on the pecking order kind of thing? I can't really go by that here, as I have 8 roos (again ), and the pecking order has changed very recently. They all crow loudly and frequently, but there are only two that do the breeding for the most part. The other thing you brought up was the henny feathering. Campines are also hen feathered, does that mean they have lower hormones and don't crow as much? I have no clue, never had them or Seabrights, but it may be worth a try. Also, in my thinking, the more close to being a feral breed, ie The Keys chickens, that is not the name and it escapes me right now, from the Florida Keys. They run feral and run in the towns without much notice. I would think being a feral breed, they would need to be quieter to survive, by not attracting predators? Just a thought, but maybe something to look into? Personally, I love the crowing...glad I live in the country!