i've always wondered about fairings in cross winds - does that make them worse?
Yes and no. Fairings cut into the wind better than the bike or your body. So, it kind of "sheds" or deflects much of the wind load rather than catching it all. Frame mounted fairings are better than bar mounted, as cross winds then don't attempt to steer the bike, as well as act as a small sail.
I recall being worried about the crosswinds before I put the Windjammer on my CB550. But, riding in 40F temps and rain made me take the chance. Yes, I still got blown sideways in high winds as I did before. But, it wasn't really much of a concern as I recall. The weird thing is that you get used to everything up front moving with the bars, and frame mounted things don't that. Kinda throws you off the visual ques at the start. You get used to that in short order, though. So, that's just an observation, rather than a detraction.
The 'Jammer sure made the bike far more of an all season vehicle for me. 10 years later I found lowers for mine. I kicked myself for not putting them on sooner, after that experience.
Cheers,