RE: Arrows Grouping horizontally?
Horizontal groups can be caused from centershot not being set correctly.
They can also be caused from torque or form issues.I have seen your form,have you played with the draw length in 1/8" increments to see if there is a sweet spot for you?
They can also be caused from punching the release.
So have fun pinpointing which one is the culprit.[8D]