I started the CG on mine in the back 1/2 of the wing tube and had about 3 ounces of lead behind the engine box for adjustment purposes. I pulled half of that yesterday and it was not as nose heavy but still required a little more down elevator to hold level when inverted than I think it should require. I'll be removing the rest of that lead next time out. That should put the CG either at the aft side of the tube or slightly behind the tube.