questions 14,
I glued mine on with about a 4 degree right offset. The font right side edge doesn't quite make complete contact with the shaft. BUT, when I'm done with the arrow I just put a small bead of glue (Fastset gel) in this gap and it fixes the problem. I feel that I can tell the difference in accuracy when they are fletched this way. It definitely spins the arrow better.

Hope this helps, Kev