You want it balanced at the manufacturers recommend CG to begin with with. The instructions should have some reference (drawing, description or otherwise). Normally the CG is checked at the root, but you can check it at the wing tip. It shouldn't make any difference. The Edge has a straight leading edge, so the distance measured from the leading edge should not change.

If you don't have a specific CG defined, a good thumbrule is to balance it on the spar. For most of our aerobatic planes, the spar, which is the strongest part of the wing, is located very close to the desired CG location, and is normally between 25 and 33 percent of the mean aerodynamic chord. Once you fly the plane and get used to its characteristics, you can adjust the CG as desired.

Since the plane was maidened already, you want to return the CG to the location it was at on the maiden flight. Since the Edge is a midwing design, you want to check it both right side up and upside down.

Brad