Yes, in such a small scale the "aerofoil" principle (aeroplane wing, upside down F1 wing etc) does not apply. Simply because the air molecules are too large in comparison to our tiny wings. So we just "shove" the air upwards + generate drag/turbulence = more grip/downforce. Same for insects, they have flat wings and just "push" the air, there's no "lift".
On low or med grip tracks you can feel the difference between a large and small rear wing, but not so much on high grip. But as to jumping there's always a difference. Nowadays wigh high grip I tend to cut the wing until "jumping performance" is good
Grip/amount of steering is easily adjusted by tyre choice/cutting of spikes.
Must admit I never really felt the difference when using a front wing or not... But it looks kinda cool
