RE: Looking for Airfoil advice
I would leave it. With it being 678 Sq in the plane would fly well heavy at 9.5 lbs and that would give you a wing loading of about 32oz a sq ft. If your careful you might get it down to 7.5 -8 lbs at 25-27 oz sq ft . It has a nice high aspect ratio wing which will help with lift.
Tim