I have shot 23/64 back tapered to 5/16 for 15 years. Last year I decided to try a 11/32 parallel dozen due to increasing costs I guess, no other reason because I was satisified with the flight of the tapers. I could see no difference in flight between the two. Most of the shooting was done at 3D and most to a max of 30 yds. I know this was like comparing apples to oranges due to the difference in diameter, but I was only interested in flight within 30 or 35 yds. When I have more time, I intend to shoot out to 80 yds to compare but for now, I plan to make up some parallels for my general shooting and spend the extra savings on something else.