Yes that's right
A warbird's wing loading can be way higher than 30 and flies pretty good because it's just the way the airplane has been done. Also, it depends on which style of flying you do. For example, if you do 3d, you'll want to have a low wing loading, but if you want to go fast, high wing loading is better.
I still recommand a wing loading under 30 for most sport planes.
Chris