dude ask around, quail breeders use chicken feed all of the time. 24% protein is absolutely fine. Breeders use it all of the time without drops in production.
You can argue specifics until your face turns blue, but if it works without sacrificing health, production or anything else, then why insist?
Eggs need to be at 99.5 to hatch, but people have incubated and hatched out from 98-103 with 100% hatch results. Wild quail aren't having wild seeds, grains, etc analysed and balanced out to a perfect increment, and they survived and thrived for years without everything being exactly on the dot.