For the cg setting for spads. I like to balance on the main spar. I like to have the nose dip down about 1 1/2" when the plane is held up for all my planes. That gives me a slight nose down that works well for me. I balanced one plane for level at the cg instead of the slightly nose down for an experiment. I had to be careful to keep the plane gliding toward me for landing. With the engine at idle, with the plane comiong in to land, it would just stop moving forward and stall if I didn't add down elevator! I added a bit more weight after that!!