Holy smokes it worked!! Thanks so much
@ilovecoffee you made this car perfect.
Got delivery today (MYLR 2023 Austin build), went home immediately, got to work. As I drove home heard the buffeting not horrible but it was clearly present.
Used the ilovecoffee methodology:
-Inserted the 3/8 OD (little bigger than the standard 5/16 OD) tubing using WD-40 Specialist. Went in super smooth no hassles it got stuck on the loop back up, so I cut it and started from the other side to meet the initial tubing. Worked perfectly in two total pieces. I did tear a little bit of the hatch gasket, its a little fragile so be careful and gentle.
-Then I adjusted the hatch stops opening and closing probably 50 times using envelope method. You can hear the latch pop loudly when opening but it closed perfectly so Im satisfied.
-Installed 3d Maxpider trunk covers (just to provide extra layer of fabric in the trunk (not sure if it makes a difference.
Went for a test drive just got back. Immediately my "test road" became super quiet the buffeting was reduced from 100% present to maybe 15-20% present. I was absolutely shocked, even my wife couldn't believe 15 minutes of super simple work made such difference.
At this point I think im satisfied with the results so I'll stop the modifications for this issues here.
@ilovecoffee really appreciate all your help.