I am not doubting Jim - I am just confused over why he is right (because I am sure it is right for him and some others). I am just wondering why... I think it may lay in tuning the bow; and after a lifetime of bowhunting; I am not clear on how that is done. I have always been happy to see my arrows fly true- but maybe I am not doing all I can.
 

Either Helical or Off Set.

Straight Fletch and Broadheads don't mix....