I don't have lowers on mine. No buffeting issues. There is quite a bit of adjustability in these batwings with the slotted holes in the clamps. Between being able to move the top/bottom angle, you can play around with the height by moving it up or down on the forks.
It took some riding, and several adjustments, but finally got it set just right.
Recently swapped my 5" shield for an 8" from Long Ride Shields that has the flip at the top.
'09 Kingpin 8Ball
'06 HD Road King
'06 Vulcan 900 Classic