The old wing loading formula is just fine -properly applied
the 27% EXTRAS - are best in the 24-28 range your 35 number is is fine ---for a 35-40% aerobat
your wing are if correct is aprox 1150 squares -the 40% stuf is 2000--2600 typically .
the flying iron (warbirds) - typically run much higher numbers ---- depends on what you want the plane to do.