Don't worry about "level" so much. The CG machine will show you if the plane's nose or tail are heavy. With a low wing plane balance it up side down and a high wing balance it with the plane right side up. If the tail or nose drops then it is heavy. This is after you have by hand made the plane level on the CG machine and then let it move on its own on the balance machine. Reposition your battery as a first choice to balance the plane. If moving the battery doesn't give you the desired CG, then some weight(lead tire weights, BBs in epoxy, fishing weights, whatever that can be firmly held in place) can be added forward or aft to make the plane balance near the CG point you want.