Now that you know it flies and the model is trimmed for straight and level hands-off flight, the final CG for acrobatic flying can be quickly determined as follows: Pull up into a 45 degree nose-up climb, then roll inverted and release the elevator stick. If the aircraft continues on a straight line, then the CG is spot on. If the model begins to descend like part of an inside loop, then the CG is too far forward. It it tries to push up into an outside loop, then the CG is too far aft.