Thats Donny (donnie) from MN. I worked with him @ the ATA show when I was with BT- Really nice guy, love his accent, and how he describes EVERYTHING (even the machining) as Smooooooooooth.

It makes sense to me- kind of cheating to get the airflow the same as over a 4" or larger vane. I've never tried it, but can't hurt to give a test, no?

Something easier would be the old Bi-Delta vanes. I used to use them- they work (but were not terribly durable or easy to fletch)