Get a Rifle windshield AND some lowers and you will be good !
RIFLE Fairings-Yamaha Stratoliner/Roadliner Replacement Windshield for 2006-Yamaha-XVZ19-Stratoliner
I had a 28" wide & now have a 26" wide.
The lowers will kill most of the buffeting.
The windshield is at the wrong angle AND is too narrow.
Yamaha never fixed it.
JJ