Sounds like it is time for some tuft testing. I'll see what I can do next weekend.
I'm assuming you are concerned about the roof air flow and nothing on the side?
Bob Wilson
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2019 Tesla Model 3 Std. Range Plus - 215 mi EV
2017 BMW i3-REx - 106 mi EV, 88 mi mid-grade
Retired engineer, Huntsville, AL
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