Stick Jammer, for a high alpha maneuver like Harriers, I would agree with you, probably the shape of the tips are more important. For a maneuver like Elevators, weight and winglooading plays a role in how fast the plane falls, and thereby how fast the tips moves through the air, and low weight/wingloading is important. When you do walls or parachutes, lighter weight is better. A lighter plane, whch transforms to lighter wing loading, just makes 3D easier, the pilot and the engine has to works less against gravity.
DKjens