The large size screen fitted too far forward (beyond the speedo) allows air to be sucked in behind it, to buffet just about where your head is. If you tuck in behind it things get better, but you still get battered by the air coming up from underneath (at speed place your arm across your chest or install a tank bag, the buffet is decreased).
A popular fix is to install lowers on the fork legs to decrease the amount of air coming from underneath.
I would recommend something a bit smaller such as a
Givi A600 universal. The smaller screen allows for greater adjustment (especially since the Roadster has none).
Hang around, I'm sure others will give you their opinions, since we all have one.
And welcome to the neighborhood.