There are some web pages devoted to wing loading formulas. It seems as the planes get larger,higher wing loading has less effect. I dont pretend to understand why,but its in black & white. As for the Do,the extra fat air foil is not taken into account in the wing loading formula. That aspect is part good and part bad. The good part is even slower stall speeds,the bad is poor tracking,precision and wind buffeting. I dont sweat the wing loading too much,dont have the patience to weigh every servo,control rod/horn,gear,ect....I think the average flyer can get his plane to 3-D fine without all that fuss. To keep it DOD & do ALL the stunts down low might require the lowest wing loading,but I,m not there yet. For now, I'm happy to do some things DOD-like hovers,harriers,walls. If I ever get good enough to try everything low,then I might start weighing control horns and swapping out grade B balsa for grade A!