Can you show a pic of your drilled food container?
I drilled a cheap, generic, plastic "shoe box" with holes near the top rim and I believe no food has been spilled from this design so far. It's important that you keep the feed level about an inch below the holes. There is the occasional wood shaving that somehow gets inside on top of the food, but otherwise, it seems to be working out great. This style feeder box does have a bigger footprint than some of the other floor feeders. but it works well for cleanliness, being low maintenance, and for eliminating food loss.
I also noticed that an experienced breeder recommended using transparent lids on this type of design because apparently transparent lids deter the quail from jumping up and doing their business on the lids. I haven't tested this. I have a white lid on mine and only two times in two weeks have I noticed a quail poo on top.
In a related issue, I'm having some trouble with the Little Giant waterers. The first problem was shavings getting in to the trough and wicking the water out on to floors. The second problem was the 4 week old quail knocking the waterer over!
I solved the first problem by raising the waterer up on top of tiles and/ or a brick. I think this is a fairly common solution. For really young chicks that can't reach a raised waterer. I created a little ramp using a tile and covered it in shop towel. This has worked out great. No more problems.
I haven't yet solved the knocking the waterer over problem. I could put a brick on top of it I guess, to weigh it down, but this would of course risk injury to the birds if it still fell over etc.