Don't fret the hatch rate too much. WIth quail, under optimal conditions, I hope for 60%. Remember too, that those eggs were collected during that super hot snap we had, where daily temps were hitting 99* here, thus not being real conducive to egg viability over the collection period.

As for chick survival. Damn things are small, and frail. Think of them as feathered sand shrimp. Sometimes you'll luck out and get a good batch, other times, you can kill'em by looking cross eyed at them. I had one hatch go 26/43, followed by a hatch that went 26/29... go figure.