Your examples of angles of attack do not quite fit in with a lot of models. Take for example my 3D profile planes which have no angle of attack, the wing section and tailplane being exactly parrallel. The wing section is fully symmetrical with exactly the same camber on both sides. This section is chosen for several reasons, e.g. maneouverabilty and invered flight. How then does it create lift that is not cancelled out by the inverse side of the aerofoil?
Relative to what? Fuselage? Tail plane? You may have 0ยบ relative to the fuselage or datum line, but flight has little to do with the fuselage. Incedence of the tail plane, engine thrust, trim settings are where the action is. You may have 0-0-0 for engine, wing and tail incedences, but at some time you're feeding in trim or have set the control throws to keep the model airborne. Otherwise it just follows a ballistic path. 3-D (IMHO) is just substituting the propeller airfoil for the wing and directing travel with large control throws.
Kill the engine and we'll see how much angle of attack your model requires to fly with a symmetrical wing.