RE: Reducing the surface area of the wings for going faster?
Designers in real life reduced wings on regular production airplanes to make them into racing planes. But what they did was to cut the span, not what you propose. There were a number of very good reasons they did what they did. And there are a couple of good (or bad) reasons what you wish to do will cause problems.
Shorter span reduces drag a couple of ways. And that modification keeps the fore/aft aerodynamic balance unchanged. The CG locations that worked before are still going to work. There is the least "collateral damage" from just reducing span.
What you want to do is going to screw the wing''s airfoil over it''s entire span. For example, at the new tips, the profile is basically 90% ailerons, 10% "airfoil". And that airfoil is a screwed one. It''s gone from a smoothly cambered profile to a sort of wedge thing that will have a relatively large thickness to chord ratio. The result is not anywhere like a highspeed profile would be. Also, the part of the wing you''re removing is going to take quite a bit more lift capability for the area removed than simply chopping the span will take. Whacking the airfoil from root to tip is going to screw the airfoil from root to tip. The entire wing is going to lose it''s lift and probably increase it''s drag exponentially.
The original airfoil from root to tip was probably a simple cambered one. Cambered airfoils aren''t the choice for speed airplanes anyway. But start to chop the nose off a cambered airfoil and the resulting airfoil is an even worse choice for speed. The farther out the span, the more nose you chop off the profile at that point the worse that airfoil becomes.
Also, if you look at the remaining wing on your redesign, where is the MAC going to be? Where will the Center of Lift of the whole wing now? The wing is now going to be lifting quite a bit further aft than before. That is going to screw up the balance.
There is a reason the aero engineers just chopped the span. Actually there are a lot of reasons they did what they did. And even more reasons they didn''t do what you propose.