I've tested various height Cee Baily screens, CalSci, V-Stream, and of course, stock.
The CalSci was good solo but not two-up, the tall Cee Bailey was good solo (haven't tried it two-up), the shorter Cee Baileys less so, the stock sucked, and the V-Stream was the worst of all.
The biggest issue is that the K16 fairings let so much air in around the sides. And the V-Stream is specifically designed to funnel more air around the sides, which just makes this worse. Wider screens do help move air away from the chest and upper arms, but the K16 fairing still dumps a ton of air into your lap/abdomen that swirls around and causes turbulence.
Another problem with the K16 bikes is that the windscreen arms raise the screen up to quite a steep angle. So you either have to run a very short screen (not good for passengers), or you have to look through the screen.
And, of course, the GT sits you higher but leaned further forward, while the GTL sits you more upright, but lower. The screen adjustment does help with this, but there are so many differences in rider height and preference that it's hard to have one screen that does everything for everbody.
I'm currently running the latest AeroFlow prototype screen on my GTL. Paige has come up with a design that works well solo, but can be raised for better passenger protection, while still allowing you to look over it if you prefer. We're still tweaking it to give better passenger coverage, and verifying it on the GT bikes, but it is coming along nicely.
And to help with all the wind coming around the sides, Paige has developed a set of side AeroGards that push the side wind out just a bit further, thus taking most of the wind off of your hands and lower arms, and leaving you sitting in calmer air. The factory air scoops still work to let in additional airflow as needed on hot days, but not so much air that it overwhelms what's happening at the screen level.
The AeroGards even worked well with some other screen types that we tried.
So what I think is the best option of all is coming along, but not quite ready to release just yet. Paige is a perfectionist, so when he does get a design that he's satified with, you know that it will be right.