212man, where did you get your figures from? If you are correct then there may well be more to it than just CoAM, however I think you are wrong about rigid rotors not coning - the Lynx has a 2 piece titanium head with a massive effective hinge offset and the blades certainly do cone (I have lots of photos of it in flight).
CoAM is the cause of precession in a gyro and they do not cone at all - the movement is produced by the mass of the rotor trying to move relative to the spin axis.