pelked1, Even though I live about 50 miles south east of Cleveland, I don't work at The "NASA" research center. But everything you said still made sense to me because of what I've seen, and read in the past.
When Chrysler debuted the Street Hemi engine in the 1966 Charger, its purpose was to be a NASCAR winner, And as it turned out, it was indeed more aerodynamic than the boxy 66 Belvedere, or the Coronet. But thanks to the extreme "fastback" roofline, it became very unstable on the high banked ovals. The "fix" was to install a flat vertical piece of metal at the trailing edge of the trunk lid. It wasn't very tall, maybe 2 or 3 inches, but it was just enough to disrupt the air flow, and help prevent lift. These cars never came from the factory with this "option", but it had to be available over the parts counter to the public to make it "legal" on the race track.
That's why I feel you were correct, and why I believe the real purpose of our respective wings, spoilers, whatever, is more to disrupt the air flow to prevent lift and create stability. Rather than cause massive amounts of "down force". I still think it was a good call on your part.