HI
BUILDING for 26 yearsfly more than most-just use you fingers most balance between 1/2 to 1 inch behind the wing spar do balance low wings upside downbe slightly nose down no fuel in the tank
if you do not know the CG-start at 33% of the wing cord
fly the plane hold the amount of up elevator you like on the left and right turns if the nose drops with your up elevator input-add tail weight ,PLANE SHOULD TURN THE CORNERS LEVEL with your up input
if balanced correctly the plane should fly inverted with a little down elevator -DONE

ENJOY BEST REGARDS TONY