I would feed little to no sunflower seeds in the summer. They r very oily and heat the birds up and give lots of energy but that ends up turning into heat. My male birds of any breed eat a few things and leave the rest for the ladies.
Over on the Cochin thread we have a rule. If they have a red comb and even that size it's a roo. Cochin pullets dont get red in the face and biggish combs till they r about 20-25 weeks. This is my almost year old and she still has a small comb.
I talked to a person who I sold my buff Brahma and he said he never crows when its cloudy or cold. But that's just him the crow collars might be worth a try...
That is a big egg!! I feel bad for the hen. My BA hen lays those everyday and she literally is screaming.the poor gen is 2 and still lays them everyday she misses about 1 day out of the week.