When I was taught to make arrows I was told that the closer the back of the feather was to the knock the faster it got the arrow out of paradox . This is within reason of course due to where the feather will touch on the face . I DO NOT like the feather touching my cheek but do not mind it touching my nose . I place it as far back as I can without touching . NOW I was taught that, and do it just cause of that , Habit after 40 some years of making arrows. I have no idea if it is actually true or if it was one of those old "Myths " of archery . It never did any harm! My arrows always fly well no matter what the point so I have no reason to change . Just my two pennies !