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To me it is a question of honesty. Straight run should be pulled randomly from the incubator before any sexed chickens are pulled, just like you said. Otherwise they are not straight run.
I don't do the Cornish cross meat birds. Out of curiosity, are the Cornish crosses sex linked, maybe a dark Cornish as the father and a White Rock as the mother? If the person pulling the chicks can tell what sex they are by color, then that says a lot about the honesty of the hatchery.
While this will not count in your meat bird statistics, I ordered 6 straight run Speckled Sussex and got 4 roosters and 2 pullets. I also ordered 6 Straight run Buff Orps and got 7 pullets. Even the packing peanut was a pullet. The order was from Cackle.