I can only tell you what I do...and that is make it one size (1/64") larger than then the screw. You want the top to move freely.
I saw a neat trick (mind not very period trick), but if you have a Festool Domino, you go all the way through with the smallest size and then plunge in just a tad with a larger size make resessed spot for a flat head screw to sit.
martin