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I spent an afternoon with a guy who was head mechanic fora Le Mans team which won its class. He was backed by a BIG factory which spent a LOT of money on windtunnel testing.
Any air which gets under the car slows the car down by causing drag. More air, more drag. This is known by ANYONE who races, and front spoiler height is heavily regulated by every sanctioning body.
Once the air gets under the car, get it OUT at the back. Run the highest possible bumper with the most amount of the biggest holes.
Any amount of restriction in getting the air out the back of the car causes upforce and drag.
These rules apply to any car which can't run aero tunnels, which are defined to be any car with a ride height of over 2 inches (you can't make very effective tunnels with 2 inches of ride height.)
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