The riser is really what changed everything. The stock angle is not allowing the tall screen to move the air up over you. The ZG ST alone did not get me (5'8") out of the way of the air. The upper half of the helmet was in the wind blast, the lower was not and right about mid face shield was the transition point. Like that, my helmet was so noisy and my head would get modulated back and forth on the highway. It did not really totally bounce my brain, but there was constant pushing from alternating sides. It kind of sucked.
By changing the screen to the more upright angle, you end up getting more of the screen turned into vertical height and also the angle throws the air up and over your lid. That puts your brain bucket out of that transition area where things are really loud and takes away almost all of the side to side pushing.
Whatever you do, give a try and see how it works out. Maybe see if any fellows from on this site live near enough to you for a meet up that have the riser, and try a bike swap for 5 or 10 miles to get a feel for that riser. You just might decide that the riser is the greatest thing since sliced bread! Or you might fricken hate it and all it stands for