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Do your birds carry the CHOC gene?
I would be very surprised if they did. My first chocolate silkies came from a self-blue splash cock X white hen. They hatched two chocolate-coloured boys and one chocolate-coloured girl. If choc caused the colouring, it would mean that both parents had to carry it. Since the parents came from different breeders, and choc was pretty rare and uncommon, and not known in the US that long ago, the chances of them being choc seem pretty astronomical. Add to that my inability to reliably get chocolate coloured offspring from them, when two visually choc birds should produce all choc offspring. I deliberately bred chocolate (Dun gene) polish into them (as explained earlier in this thread), and the offspring colouring seems to follow the correct percentages for Dun.