I found the standard short screen makes no difference to noise or buffeting. i.e. it was the same without.
The Dakar screen made it worse for me as it channeled the wind up into my face.
I rationalised that as I rarely travel on M/ways and dont get above 60mph that often that I was as well to stay with the standard screen or dont bother with one at all.
There is more wind pressure on my chest with the small screen but you have to decide what you`re going to use the bike for,
Dave Hall - Interdum vulgus rectum videt.
`04 F650GS twin spark