Put a wind deflector on, see If that will help with the wind noise. Had to make up some custom brackets as the Thule supplied brackets wouldn't fit OEM roof rack. :
Thule AirScreen XT 52" Wind Fairing 870203
How to make roof rack wind deflector spoiler inspired by Yakima? - YouTube
Amazon.com: Thule AirScreen XT Wind Fairing, Black : Automotive