I have about 20-25 flights on mine with the CG at 125mm. I have flown the plane teetering at that point and slightly nose heavy, it seemed to handle about the same to me. What engine is that you are using it looks awsome! I had the Saito 180 in mine and now it has an RCS 180 (hven't flown it yet with the gasser). What is the weight with your engine? Mine was very heavy but it still flew great, its lighter with the gas engine.