First thing I'd do is put your battery in the left wing leading edge. You always put the battery in the left wing of a profile to counter the engine weight on the right side. Then you could probably take off the weight on your wing tip. The recommended cg is for starting out but you can go up to an inch further aft for ultimate 3D. To be perfect for 3d trim the plane for level flight at about 1/2 throttle and then roll inverted. If the nose drops you are nose heavy, if it climbs then you are tail heavy.