I have been able to remove virtually all turbulence by adding the TT spoiler on top of the standard screen and using the HG Tuareg handle bar bag to block the air stream from between tank and fork legs.
The remaining turbulence seems to be caused by the mirrors now.

your mileage may vary though, depending on how tall you are and how you are usually positioned on the bike.

you could also try removing the screen alltogether. Or -what seemed to work on my TDM and Diversion- drill some holes in the screen just above where it comes over the dash. This will reduce the vacuum behind it.