Wing loading in oz./sq.ft. are not very meaningful on larfer airplanes. You should use wingvolumeloading which is calculated as follows:
(weight of model in ounces) devided by the wing area in square feet raised to the 1.5 power i.e. weight/area^1,5
If that value is 10 or lower the plane will fly fine. If 11 to 12 it means you have to watch out for tip stall on landing (keep the speed up). If more than 12 you probably have a lead sled. A value of 7 or less says you will have a real floater on your hands. This formulae works well for anything from 8 oz. electrics up to the 40 pound giants and is a formulae proposed by a Mr. Reynold's in the Sept 1989 issue of Model Builder.