Oh cool ! Thanks for doing the tuft test. I've been wondering for years about the A pillar vortex on that particular car.
The tufts that you had look a little long. I used ones no longer than 3" or so and spaced them so they wouldn't tangle on my test.
I suspect having the tufts any longer causes more flutter than there should be and this can be confused with turbulence in that area.
You can clearly see the A pillar vortex on my car compared to yours :