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Wow, great results, I'm so happy. I sort of feel like a number of us had a part in making this happen. And that's an impressive broody you have there. I bet she is very happy to have all those chicks.
I don't think you can rely on feather sexing at all. You might see differences because the slow/fast feathering genes are present, but it takes a carefully setup breeding to link that to the sex of the chicks. The only reliable way for regular chicken keepers to sex chicks is by careful hybridization to makes sex links, or with an autosexing breed. The autosexing breeds are great and eggs from those breeds should be a lot more available next year (I presume you will want to do this again, it would be a shame to not employ such a talented hen).
Another note about the genetics - your "lavender" Ameracuna chicks are really "blue". There are 2 genes that produce blue and they have very different results. Because they all have a lavender parent (the roo you raised last year), they are all carrying 1 copy of that gene, but it's not expressing in any of the chicks because it's recessive and so you'd need 2 copies to make the bird lavender. The mother, however, has one copy of the "blue" gene and that is partially dominant, so it always shows up, in this case in about half the chicks because the lavender roo is really "black" as far as the blue gene is concerned.
The interesting part is in the next generation. If you get black hens, those could be crossed back to their father and half the babies will be true-breeding lavenders, the others will be genetically like their mother (carrying lavender, but look black). The blue hens will produce an very strange set of offspring if bred back to their lavender father - 50% will be "blue" and 50% "lavender", but some (25%) will also be black because those 50% will overlap in the blue chicks. IDK if you will be able to tell the chicks that are expressing both type of blue. They could look like either type of blue or like an overlay of both types. I think troyer is working with this also, so we may have a local source of lavender ams next year.