If you wanted a bike where you might be sat in a bubble of still air, some might argue that the R1200/1250 was maybe not the right bike for that, nor any naked bike.
The aim of a screen for a naked bike is more to reduce buffeting but allow air flow, and allow rapid progress without your arms and neck getting fatigued. Riding without ear plugs will damage your hearing no-matter what bike you ride. I have tinnitus because I rode for years, like an idiot, without plugs, so it's a strong recommendation to any biker that it is as important for your health as any other safety gear you wear.
A taller screen might do the trick but could spoil the looks of the bike. FWIW, I find the same with my MRA. It's not the quietest but I like the air flow and the fact it doesn't cause buffeting. I do like the look of the MRA on the "R". It looks in keeping with the bike.