ij-

For that instance I mentioned, yes, as I backed off the limb bolts my b/s was walking to the left on the target face with each group. I then went back and chopped some length off my arrow shafts and started over again.

Now keep in mind that you can also move a b/s closer or farther to the left or right by making slight centershot adjustments. So which is it? Spine or centershot? It may take a lot of tinker-time to determine which one will provide the best results. If the spine is off quite a bit you may never be able to get the b/s to group well with fletched shafts, no matter where you put the centershot.

Lots of trial and error and you can see why people don' t want to mess with doing it.