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I'm with Daox here. A slight change in wind direction could have done that.
Just because the tufts moved more does not mean the smooth covers would create more overall drag. There are times when increasing frontal area lowers the Cd. Any change in the airflow pattern will change everything around it including in front of the car so perhaps that's what you are seeing there.
I kind of doubt those rims could blow air inwards. RPM is too low and outward pressure too great.
Still a good test and interesting to see.
Have you thought of rounding the trailing edge of your wheel well? I'd love to see how that smoothed things out.
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Vortex generators are old tech. My new and improved vortex alternators are unstoppable.
"It’s easy to explain how rockets work but explaining the aerodynamics of a wing takes a rocket scientist.
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