I notice what looked like an area of turbulence just behind the top of the wheel in the tuft test that you did. It looks as if the wheel gap filler that you added juts out quite a bit. Any plans on making it more flush ? I would seem as though the air is hitting the thing like a ramp and then being sucked back in towards the low pressure area at the back of the wheel.
( just my unejekated guess )
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