I've never had large fowl genuine Cochins, only bantams (Pekins). All the roos I've had have been really hard on the hens and sometimes aggressive with people, and the hens are just downright grumpy!
Where did you get them? Hatchery or breeder? My breeder Cochin bantams are the sweetest things, and the boys are what I'd call feisty, but not aggressive. The worst they do is peck every now and then, but they also stand at my feet to be picked up and let me stroke their feathers. All except Gus, who has a tough guy reputation to keep so he can't be seen being pet or held, but he'll maybe hop in my lap sometimes if I sit in his pen with him and his girls, as long as I don't tell anyone.
