Ciro: i still don't get it right with the air wing, and i explain why:
You can't use the action-reaction law on soft bodies like air molecules.
when molecules collides they don't follow the rigid collision's law, You can have basically three type of collision, one like rigids where the molecules bounce off with less energy than before the collision, bounce with same velocity and sometimes even with more energy than before their collision.
All of this is governed by their degrees of freedom far more than with rigid bodies.
This gives you, at large scale the point i talk about: if you apply a force on a elastic body (like a fluid) the body doesn't react with an equal opposite force, it simply changes his disposition, and the force applied is absorbed by collisions and friction between molecules.
The only fact a wing is pushed on the ground (or lifted in the air) is because a wing is mostly a rigid body and because air exerts pressure differential on it.
By himself the air does nothing else (except for a % of cross sectional drag that have a component toward the ground, for example when a flap is tilted at high angle for high downforce).
So an air wing would probably do nothing pressure wise (if we aim for downforce) on the air, nothing interesting for our purpose(their would be of course interactions and corruptions for sure).
About vortex, please be aware that the problem is their existence alone.
A vortex is beneficial when it comes helping the boundary layer staying laminar.
when you follow a car, even if the vortex is stable what happens? you have the vortex coming alone and nothing else, this means you don't have you boundary layer.
What is the problem really are vectors of the vortex. If vortex are created and stay stable in direction that goes just where it is useful okay, but we're then another problem: when you create vortex you necessarily divert air in a direction either this direction is of no use but doesn't decrease the efficiency either the opposite but from a pure aerodynamic point of view it is almost impossible to have a vortex that stay from one car to another in the same direction.
That's why active wings are planned, they could use more stable vortex (the vortex will be more stable because of new diffuser and rear wing design and less aggressive front wing)and by lowering the front wing will take benefit of it.
About elliptical, the lift repartition is good....when the AOA is not too big, i unfortunately saw in live what happened of a spitfire a very low speed and high AOA (may the pilot RIP).
By the way you're totally right about lift distribution on wings, recent fighter planes have down twist about the wing tip to reduce the lift in order to achieve better induced drag specs.
one thing however that differentiates planes from F1: the Yaw, F1 cars turn by yawing, not planes so you need to have very good downforce potential on wing tip when in yaw condition so twists are maybe not the best choice there.
See ya.