If you've only been flying for 6 months and have moved from a .40 size trainer to a 1.20 aerobat you must really have the"gift". The manual for the plane should tell you where the acceptable range is for the c.g. It's usually, but not always, at the main spar on the wing. When it is "balanced", the plane should be horizontal, meaning that the chord line of the airfoil should be parallel to the ground. Start with this and fly the plane for a while. If it wants to climb, it may just need trimming for level flight. A rearward c.g is buying trouble because it will make the plane less stable in pitch and beyond a certain point the elevator will lose authority. Center of aerodynamic pressure must stay aft of center of gravity to maintain stability. I can't help but think that you're not ready for this level of performance only 6 months out from learning to fly; no offense meant, but learning to fly is like Airplanes 101 your freshman year. and Edge 540 is a graduate course.