So how does this apply to the old ballistic 60-size pattern planes?

The reason that I am asking is because I am currently designing a 1/6 scale Pilatus PC7. I have drawn and figured out the wing plan
Wing span = 68 inches
Square inches = 712
Square feet = 4.95

Using the formula above and if I can keep the plane at 8 pounds I get
Wing Loading = 25.88 ounces/Square foot
WVL = 11.63

The size of this will end up being close to the ballistic pattern planes. All of this is if I can keep the plane at 8 pounds with retracts and struts, split flaps, etc. Current engine idea is the ST90.

Any thoughts?