Jack is exactly right; an airfoil doesn't know how much the plane it's attached to weighs. Airspeed and angle of attack are the only things that matter to it. A wing, however, often has what is called wash out- which means that the angle of incidence relative to the fuselage is smaller at the wing tip than at the root. This ensures that the local angle of attack at the tip is less and therefore any stalling will begin at the root and progress out to the tip. This is good for a number of reasons. If the ailerons are outboard, as with most scale airplanes, you can detect the stall while you still have some aileron authority left and can recover before you loose control. Tip stalls are nasty because your first indication is usually a flash of adrenalin as your plane departs from controlled flight. I mentioned snap rolls because they're a common consequence of a wing without washout that gets stalled. Some models don't have any- don't know about the GSP.
Easytiger has some chilling stories about his Marutaka Raiden which had a similar high wing load. Don't remember the thread, though you could search on Raiden.
If you know all this stuff already, please forgive my pontification-- I'm an old IP, and we are forever explaining how to build clocks to people who just want to know what time it is---just ask my wife!
John