mspouth, if you havent already, move the battery to just above the fuel tank, dont add any weight if possible, this plane likes less, Ron should chime in, i think he had a ys63 in his once
as far as cg, if new to this plane about 5 inches is great and then as you loosen up a bit you can go as far as 6in

Great idea CEEGEE(HEEHEE) but its too hotttttttttt nowwwwwww, it would be one quick reunion, everyone would go home about eight