Ahh, like a pair of Jimmy Choo stilettos that screen may look great Rocketman but by the end of the day its killing you to look that good.
You identified your solution: clean air flow. You find it when you stand up and the wind blast noise disappears.
I'd suggest this a starting point: temporarily remove the screen. Ride it like that. Buy a handful of Moldex or similar disposable foam earplugs (ignore anyone who suggests custom made musician ones or something. Not just yet.) When you take the ear plugs out put them in your right front jacket pocket. Only there. No, not the left. The right pocket every single time. In the pocket next to your bike key, Ok?
Key, ear plugs, helmet (don't forget the strap - we've all done that), gloves, ride off. Every time. Its not onerous to do it the same way. Now when you do - and you will - ride off without the ear plugs you pull over and stop. Make your buddies stop too. Take it all off and put the plugs in this time and after just a few of those occasions you will never forget again.
As an aside, look in your mirrors when you all pull over. Look sheepishly if you must tapping yourself on the helmet as the universal "I forgot my earplugs" gesture, but have a look back through the line and I bet one of your mates is fossicking around in his jeans or left pocket or something to find where he put those stupid earplugs last time he stopped.
Now, I realise that you are from Colorado so it can get cold, real cold. While running your clean air experiment try any or all of these tips and tricks: put a newspaper down the front of your jacket; buy a better jacket (works on all bikes, not just this one); heated vest or some such liner; put on an over jacket; get one of those thick fleece neck tube things (as a bonus they cut the airflow around the lower edge of the helmet).
Once you are convinced that it is clean air you may opt to continue real naked, naked. Or you might want to go back to the endless screen trials. Your beautiful Jimmy Choo Puig screen is crap - for you.You told us that up above. Drill holes in it. You have little to lose, just do it carefully, systematically.
Like those multi-million dollar MotoGp prototypes, sometime the screen is just, well, crap. Drill it like they do. In doing so you are after a magic carpet of slower moving air to come up from behind the screen and fill the void and equalise the airpressure that is contributing to the turbulence currently and luckily absent from the Tiger 800 cockpit.
I once did a fly and ride when I bought a BMW K1200R 800km from my place. I rode away on the bike it had a screen something like this:
I lasted about 10 minutes and had to take it off and tie it onto the back of the bike.
It was so much better.
Later I added a little screen just to keep the bugs off the back of the clocks: