Now that you have determined the arrows you should use you need to fine-tune your bow to maximize your arrows consistency. Most people think that once you set up a plunger and a nocking point it is all good to go, however that is not the case. The center shot of your arrow is one of the most over looked things when setting up a bow.
The center shot is where the arrow rests on the bow when looking behind it. When setting up your center shot the arrow needs to be completely behind the string. Most traditional bows do not have a cut-away in the riser and the arrow has to deflect around the handle with something called archer’s paradox.
Archer’s Paradox: The term was coined by Robert P. Elmer in the 1930s. The paradox refers to the phenomenon that in order to strike the center of the target, the arrow must be pointed slightly to the side of the target. Modern use of the term has caused the interpretation of it to be corrupted and the bending of the arrow is often considered incorrectly to be archer’s paradox.
In order to be accurate, an arrow must have the correct stiffness, or “spine”, to flex out of the way of the bow and return back to the correct path as it leaves the bow. Incorrect spine results in unpredictable contact between the arrow and the bow, therefore unpredictable forces on the arrow as it leaves the bow, and therefore reduced accuracy. Additionally, if an archer shoots several arrows with different spine, even if they clear the bow they will be deflected on launch by different amounts and so will strike in different places. Competition archers therefore strive not only for arrows that have a spine within a suitable range for their bow, but also for highly consistent spine within sets of arrows. (Wikipedia)
For an Olympic archer, ideally your set up should be 100% behind the string. Some people actually require the arrow lean a little to the opposite side of your riser so that the arrow can get past the bow without hitting it. You can reduce the effects of “Archers Paradox” by adding spin to the arrow by fletching your vanes or feathers with an offset or helical. It is critical that the arrow must have the correct spine so it can bend around the bow, so the fletchings do not touch anything for consistent arrow flight.
Therefore, once again I stress, for proper safety and best performance, arrows need to match your entire bow setup.