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You guys are making this way more complicated than necessary. You aren't seeing the forest for the trees.
The optimal shape for a practical vehicle travelling on the ground is NOT a teardrop. It's a half a teardrop. That shape produces downforce on the front, lift at the rear, and a net upward force.
In order to make the half teardrop neutral on the front end, you must curve the bottom, which counteracts the downforce from the top with lift from the bottom, but also increases drag because air must be compressed to go under the vehicle.
In order to make the half teadrop neutral at the rear, you need a upward angled bottom surface aka "a diffuser". This is limited by the amount of air you have flowing under the vehicle.
Or you can be neutral by shaping the vehicle like a brick
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