@U_Stormcrow, congrats, they are adorable! Love that you take picture of them on a scale!
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I have an Office Document for the whole project, combining Word and Excel. Will probably bundle in PowerPoint next, as I am taking pictures along the way in an effort to discern which hatchling patterns become what adult patterns, since more than half of what I am breeding for is adult color/pattern. That way, if a neighbor wants to buy some hatchlings, I'll at least know which I can sacrifice for the feed budget.I take pictures of them on the scale and I enter the data in a spreadsheet!
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I reread your goals. From that I guess I don't see why you are hatching from all hens. It seems to me the darkest few red Rainbow hybrids are closest to your end goal and your cock is barred so there's you're pattern.
They have the genetics for size, growth and laying. They also have the desired red factor and egg color. All you have to do is pull out of their genetics what you desire. The chance of getting there in short order are greatly increased if you only hatch their eggs. Cross the best from them to make F2. Those will be all over the place in terms of size and growth/maturity rate. F3 should really show headway. If you hatched enough of F1 and F2 generations there should be the color with barring in great numbers in F3 also. Maybe there will be something to backcross to in F2 but I believe your real start to defining and keeping future breeders will be in that third generation.
I mention it as your incubator can't take many eggs. Most of the hens don't have the traits you desire so why not nip all that early and get a jump by cranking out the best Rainbow's chicks. Just set up a breeding pen. With hands on evaluation of the Rainbows you could narrow it to the best two hens. That way you're almost hatching every egg they lay. If signs of over mating show then just put the cock in with them every third day to ensure all eggs are fertile.
It's a thought. Below is a link for hands on evaluation for meat quality-
https://livestockconservancy.org/images/uploads/docs/ALBCchicken_assessment-1.pdf