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If I interpreted your results properly, wheel well covers lowered your Cd, but vortex generators raised the Cd (didn't see any tests on belly pans in your spreadsheet). This is to be expected since the covers would smooth out the airflow along the side of the car. Vortex generators are usually used as bandaids to try to fix or reduce an aerodynamic flaw in a car's design and, depending on their positioning, can either raise or lower a car's Cd. Since their positioning is very critical and takes a lot of research or trial and error testing to find, for most people they will end up raising the Cd.
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