Stuart, wing panel weights are without tube, without servo, without linkage? If so, that is a fairly heavy panel, and probably the primary area Oxai could address if they wanted to drop the plane's weight by ~4oz. Wings that size, balsa-sheeted foam, with 2oz servos and linkages, no tube, PBG 7/8" CF sleeve, Ultracote covered, can be 15oz rather easily.
-Adam