I am not a scientist.
In my mental wind tunnel, I see this:
-Lower the rear end puts it more into the wind
--Increasing the frontal area
--Changing the angles air normally interacts [with the underbody]
-Changes the angle of the roofline
--Ruining the already damaged airflow
An air dam is the easy way out, but your best bet is to duplicate the stock stance, but as low as acceptable for your life/conditions, and then do an underbody.
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