The noise comes from the shape of the wings on the rack. Nothing to do but either take them off or get a spoiler.
Ron, Newthings, myself and a few others have developed our own "spoiler" for the rack. Newthings and I have a Yakima Load Warrior but the concept is the same. The Load warrior comes with it's own spoiler but, I didn't care for the small size.
Ron's site
Newthings' custom spoiler
My custom spoiler compared to original Yak
See the whole thing
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