What I would add as to the Kwik-Fli is that it might have more roll damping than the other models mentioned. Even though the thick and blunt-leading-edge NACA 0019 airfoil has a not really steep lift-over-AOA curve, the square wing planform and lightweight construction make for a quick and clean stop of the roll movement in spin, even without ailerons. (In Denker's classification of spins, it's an example of a flat lift curve even post-stall, without hysteresis.) Besides the Mark III Kwik-Fli has a big vertical tail and high-leveled stab, and I think that all adds up to the clean spin exit. It's also a typical example of the airplanes that are actually reluctant to spin and, once brought to spinning, are easy to stop.