I've found that on the GP CG Machine, you want it to be a bit nose heavy. Pretty much to where you can let the plane sit there hands off, but still leaning towards the nose. I balanced my Hangar 9 P-51 Mustang PTS to where it would sit level hands off. It had no fuel in the tank, and was inverted on the CG Machine. When I went to fly it, it flew very tail heavy and I could not put in enough down elevator to compensate. I'm a noob to airplanes, so take my experience w/ a grain of salt.