By the way, I just checked and I have the same gap. Can't see how how it can be eliminated as the flyscreen is curved, and it seems tight from the sides.
If you end up getting rid of the gap somehow when you install the carbon, let us know.
Oh, and between CW and Zard, my recommendation (not that it means anything) would be the CW exhaust. Sounds like a WWII bomber. Intoxicating sounds throughout accel and decel. It is loud and awesome and make the R3 sound like it looks (i.e.: BEAST). Both are expensive for what they are, but the Zard price is pure criminal and doesn't sound anywhere near as good (unless you like tame and soft).
I am not a rep for CW by the way

, I just enjoy a great sounding and loud exhaust.