I'll jump in and agree with Tom that you need to have the fairing extend outward past your hands. This year Brian ran with two different fairings on the front of his bike. The first was a cafe type fairing that was recycled from years past on Tucker's and my bikes. With this fairing he ran consistent 99.xxx mph passes. He swapped to the larger fairing that we made to fit the bike and him and with no other changes made several 102.xxx passes. This experiment proved to us that a full coverage fairing is a worthwhile project.
Tom, on the subject of polycarbonate vs. Plexiglass, I don't believe that Plexiglass is in any way safer than polycarbonate. Yes, it will shatter on impact rather than resist your motion. However, the resulting shards will be razor sharp, and quite probably slice right through anything they encounter, your neck included. Polycarbonate can be formed to with a little heat and patience, and the edges can be sanded round and polished smooth so as not to cut anything. Buy a piece of each and break them, or try to in the case of the poly (wear long sleeves, gloves, and safety glasses when you break the Plexiglass, as it tends to explode when it breaks). If you're worried about hitting it in an accident, mount it so that it will come off if struck from behind, but be secure against wind forces from the front. A bit of thought should provide the answers to how to do this, as I don't have those right now, LOL.