What affects "fighting the starter":
CCP
Flywheel or converter weight (actually inertial mass)
Number of cylinders
Rod ratio

There is also another "RPM vs. spark position" in addition to centrifugal with vs. spring tension: tha shape of the weight. Examine a GM (easier to find) plot of engine speed vs curve and you'll notice that the curve is distorted (made non-linear) by the point where the weight’s concave radius contacts the center plate, which changes as the weights move. The weight normally acts against the gradually tapered side of the center plate. However, at very high RPM it continues to advance at a much slower rate, which may not be detected but may be enough to cause damage.