I have found that weak arrows will just about always hit to the right, and too stiff of an arrow will often hit to the left. This has often been readily apparentduring bare shaft tuning - ie. comparing the impact point of a fletched shaft with an otherwise identical unfletched shaft. And when the two hit the same out to 20 yards and beyond, it is a pretty confident assertion that you have the spine matched perfectly.

Well, I did some playing today. I needed to move the arrow rest about 1/32" to the left to get things to print in a straight vertical line. Haven't had a chance to see if my broadhead and field point impacts are still the same. With any luck . . . . .