I wouldn’t enlarge the pilot holes in the base, but if they’ve puckered up after putting in the screws, you could plane or sand the area around the holes flat again.
Here’s a chart from Machinery’s Handbook for wood screw pilot hole sizes. Part of it’s covered up, but you should be able to figure out the sizes. I think the screw sizes are 10, 11, 12, 14, 16, 18…
