Here's a bit of screen advice which may be obvious to most but wasn't to me.
A few weeks ago I bought a GSA screen for my GS. Once it was on, I went out for a ride, set the cruise control at 70mph and whacked the screen right up. The noise was less, but not as good as I'd hoped. After a few more tests at different speeds, I decided that the screen right up was the best option and left it alone.
This week however, I was fiddling again, and noticed that right near the top, the screen changes angle significantly, and goes from upright to a bit laid back. So I tweaked the screen down just a quarter of a turn and lo-and-behold, noticeably less noise. I know screen results are different for different people, but for me, just tweaking the screen back to more vertical - maybe 10% of the range from top - made a big difference and now I'm happy with the noise and the expense.
On the subject of screens, my original GS screen has 1cm long cracks in all directions from the top 2 mounting holes. They weren't visible on the bike, but I guess they might have become so over time. I'm expecting the same thing or worse on the flappy GSA screen.