Generally airfoils with zero or low values of camber or airfoils that have lower pitching moment values will make do with a smaller tail. But the downside of a small tail is that the CG ends up being further forward. All else being equal the wing has to work less hard (think while in a pylon turn) if the tail is a little larger and will support a more rearward CG location while still keeping the model stable.

Shooting for a 30% CG location while still retaining a small % of positive stability is likely not a bad location. Size the stabilizer area such that when you run the numbers you end up with a CG located at that point.