An adjustable shield extender that is set mostly forward and slightly up works very well for me (5'-11"). I also have larger hand guards but no mouse ears. This is on a V85 Travel shield.
I seem to recall a Polish Guy developed them for a 3d printer then open sourced his design so anyone could print them. I think if you search the files on one or more of the Facebook groups it’s still there. All you then need is access to a 3d printer.
Is that extender with the standard low screen or the touring screen. Just thinking of things to try. Those Mickey Mouse thingies seem to be widely liked.
I found the same, Guzzi touring screen increased buffetting.
an MRA X-Screen on the top of the tall screen reduced this a little.
For me, the best option was the Givi Airflow 2 blade set up.