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I could see these girls walking around your back yard. Gentle and talkers. Unfortunately not the best layers. Her confirmation is lacking-to be expected while they set the color.
I did the same as you for about 40 years. Then the CornishX and the commercial hybrid egg layers came along... My flocks were shown the stew pot and the rest is history.My best layers came from saving and breeding replacements (male and female) from chicks that hatched from eggs laid by hens that laid well. They did not have to be F1's. Some of mine went several generations before I brought in new blood.
If egg-laying were your only goal it's hard to beat the commercial egg-laying hybrids. They are bred for one thing, lay a lot of large eggs for at most two egg-laying seasons with a great feed to egg conversion ratio. Then they are done and you replace them. it's like you can't beat the feed to meat conversion ratio of the Cornish X broilers, the broilers and the egg laying hybrids are specialists, but neither really suited my goals.