Wing is too flexible make it more ridgid and it will be a lot better. Try and try mounting the wing above the car rather than sitting ontop of the roof. This will reduce drag coming from the air that cannot go under the wing in the middle. Mount the wing also closer to the rear axle as well to get more lift at the rear.
I remember that large airliners had a problem with too much weight and not enough wing length. They fixed this issued by adding a small vertical section on the tip of the wing. Have a look a some boeing 747 wing pictures and your get the idea.
But i would say a successful first attempt. The car deffonitly looked like it wanted to lift.
Well done.
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