You're theory is based on the argument that the method used by manufacturers accounts for equal COG per blade. Nevertheless they are making plastic pieces for pennies in china. There is not that much thought put into it. Hence why some props are total rubbish to begin with. Pitch, cup, thickness, rake etc. All take precedence over this COG theory. What would be most beneficial would be to ensure that the leading edge always be the point with which the mass is greatest.