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I usually hatch like that too. My last batchof quail i got 1 roo and 5 hens, which is the exact ratio for a pen. it was like winning the egg lottery.
Can you possibly divulge a little more info on vent sexing or take pictures next time of a male and a female. I really want to try it. I tried it today with a chick that was a few hours old and I could see little pearl bumps on either side of the opening. I'm not sure if I had it open wide enough? I tried videos on youtube but it's just hatcheries and they're working crazy fast so I can't tell what they're seeing. Would be nice to have someone who does it reliably to give tips.
Lemme get you the pics, I use a stand magnifier for quil, but on chicks, I don't need it.
https://www.backyardchickens.com/forum/viewtopic.php?id=150049
In the first pic, you'll see a cockrel, if the vent was a clock face, the "bump" is at 7:30. To expose the vent I GENTLY streach the tail toward the back, which opens the vent (no squeezing, it's not a squeeky toy).
Second pic is a hen, no bump, just the slit. After the first handful, you'll be getting it. I've had ones that are clearly male, some that are clearly female (bumpless) and once in a while i'll get a ? chick. those i come back a few days later to look.