I've just (05*02/2012) cut down my stock (2010-2012) shield for summer usage. Took about 4.5"-5" off of it. I also added the Cal Sci. cutout to it. Took it out on a quick ride and I didn't have any turbulence at all. Getting a good amout of air all the way from full down to full up. I do feel that the Cal Sci. cutout is what has helped the most with eliminating the turbulence.
For referance: I'm 6'1" w/34" inseam.
I've also got the V-Stream. No turbulence with it either, but it was just starting to get too hot behind it in 90 deg F temps.