FWIW, 70's era pattern plane designers asked this sort of question a lot. One of the more influential ones was Jim Kirkland who designed the highly successful Intruder. His experiments indicated that it's the shape of the leading edge more than anything else that determines the stall characteristics of a wing. So his practice was to choose an airfoil (a NACA 0015 for the Intruder) and just keep the LE profile as he tapered the wing. That effectively gave him a more blunt leading edge and a thicker percentage airfoil out toward the tips. That may not be the most technical engineering ever done on an RC plane, but it did work. His designs flew very well and are still pilot friendly with no bad habits even by today's standards.