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Hi
Are you trying to improve FE, too? The spats you are referring to -- are they wheel skirts, or deflectors? (A pic or two would help.)
Nobody has mentioned a front upper grill block and/or a gasket under the front edge of the hood to seal the gap. This will reduce drag and it may even improve cooling. It might reduce front end lift, too?
A rear deck spoiler will only increase drag and it'll do squat for lift. Turbulators will add more drag, and do squat for lift.
A front belly pan (or a full length belly pan) will lower drag much more than a chin spoiler, and it would not increase the frontal area.
A Kamm back would reduce drag, and probably lower rear lift.
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