To DKjens: GP does not negate the yaw force created by P- factor or somehow convert it to a pitch force, it causes a pitch force which is in addition to the yaw force. This pitch force is in fact a response to the actual yaw motion caused by GP, not a response to the GP force per se. Consider this: A prop with zero mass would cause P-factor forces, but no GP forces. A prop with mass but zero pitch would have no P-factor effect (because it would produce no thrust), but would still produce the GP effect if airplane is yawed. The advice not to bring the issue up with the flight examiner was good.