I only read the original post and parts of the rest. I'm not going to attempt an aerodynamics answer, but a practical one that may save your wingtips. My Herr Pitts Special is a ground loop nightmare. About 1 in 4 take-offs is successful and the other three result in it scattering it's struts across the field.

What a friend discovered is that if someone holds the the fin while the engine is moved to full throttle and then releases the plane, the aircraft will immediately start tracking straight. Not exactly what you'd want to do for an audience, but the ratio of ground loops has gone down considerably.