I found the exact same thing with the shorty shield. No issues at all with the tall one. Another thing I noticed was that, while the wind flow was smooth over the shorty (going solo, anyway), it was still very loud -- louder than any other bike I remember, even those with no shield. So much that I did a ton of research on the quietest helmets (that didn't cost a mortgage payment) and still dumped a bundle on a new one to try to quiet it down. It helped, but it was still too loud, and that's what convinced me to get the tall shield. Even with the tall shield, I still get enough air on me on hot days. You may find you won't need to swap them out seasonally.I love the look of the short shield, but my wife and I experienced a lot of helmet buffeting when we rode two-up. There was no problem at all if I was solo, but when she got on the back, it messed with the aerodynamics and after a couple of hours I could feel the strain on my neck. I mentioned it in another post, but it's worth repeating: Swapping out windshields is very quick and easy. I really do intend to switch to the shorter shield in July for the increased airflow, then back again probably in September. As far as *advantages* go... I think more wind in hot weather just about sums it up. Having said that: this isn't a Goldwing, so you will probably get enough air even with the taller Honda shield.
I'm glad to know it's not just me! I thought I was crazy when I noticed that my old Magna had less wind noise. Now that I think about it, maybe the shorty shield tends to funnel more air right into the bottom of my helmet. And I agree with your sentiment on the shorty shield: I would probably be just fine without swapping at all.Another thing I noticed was that, while the wind flow was smooth over the shorty (going solo, anyway), it was still very loud -- louder than any other bike I remember, even those with no shield.