I doubt this will help much, but here is a 12 week old Cochin male:
He was already showing his red by the 7th week.
If you would ever like to get rid of the Cochins... look me up!
I had assumed that you were breeding splash to splash in order to get a more uniformed blue, but I'm not quite certain as to how you would get a more even blue color on a splash bird. Were you intentionally breeding towards a self-blue/lavender bird? Or was it a happy bloop?
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I'm just wondering, since pedigrees and such are not required for showing, could you show one of these types of birds as a lavender if the color was uniform enough?