A far better method than wing loading to determine how well an airplane will fly is "Wing Volume Loading" which is defined as
(weight of the model in ounces) divided by (wing area in square feet raised to the 1.5 power). This works for even the smallest park flier to the largest scale models. If you find the value greater than 11, chances are you have a lead sled and if it under 6, you will have a real floater on your hands. If the value falls between 7 and 10, chances are you have a nice flyer. I think you will find most good trainers running around 7 to 9 for WVL. This doesn't mean you can not fly a model with a WVL greater than 11, it just means you really have to keep the landing speed up and watch out for tip stalls.