Grats!
Quail can be messy eaters, but thankfully they're nothing like ducks! One way to keep the feed consumption lower (but more bang for your buck) is to ferment it. Fermenting helps reduce the anti-nutrients in grains, making food far more digestible & less need to over-eat. (Same thing with humans) Also, with it being moist, you get more liquid into them which helps them grow better.
Fermented Feed can be searched on the BYC for 'FF recipes'. There's a few ways to go about making it, one super easy way is to do a 'simple' ferment by adding a tsp of yogurt into a food safe container (glass or ceramic cooking/crocks/canning jars), stir it up & let it sit overnight. Just strain out the feed & serve wet. You can also leave the liquid for them to sip up (although that may be messy) or even toss it in your compost. Another method is using Apple Cider Vinegar (ACV) with 'mother', just a small 'glug' per gallon of feed - making sure to keep the water level higher than the grains (post-soak stage).
Best of luck with the little ones!^^