One of my favorite things in vertical arches is that despite the huge technological progress of the last few decades, it still requires a huge sacrifice to put the arrow where you want. Even with high elaborate bunks, technologically advanced publishing houses and fiber optic sights, a dozen or so things still have to go exactly to hit in 10-herself.
I know how everyone in September will be here in the blink of an eye. If you have some problems with grouping a shot in the middle ring, here are the most likely reasons.