I built the Quality Fiberglass C-130/AC-130, 102" wingspan. Don't know how that compares to the Skip mast version, but the plans on mine shows CG at 3 1/2" back of the Leading edge at the center of the wing. My wing chord is 12 1/4" at the root. I balanced it where shown and it flew with very little trim changes. Mine weighs 17.25# dry.
I'm flying OS .25 FX. At your weight, the .40's will probably be good.
Randy