RE: Group tuning question?
This is a very hard long process with many ways to do it. Most work some don't. Here is how i do it. All of your arrows at all distances should hit in the same left/right spot. Here is how i check my center shot of my bow. Start at 10 yards shot on arrow. Then 15,20,25,30,35. Make sure you know which arrow you shot at what distance( I try to put mine in a line short shots high). Discard all bad shots(go pull the arrow are shot it again right away). Normally i do this twice before i move the rest. Okay now what does this do? If you make a C shape. Close and far arrows are to the right. The middle distances are to the left. This means your rest is to the left/out to far. Move it in and do the same test. If you have a backwards C Close and far arrows are left, and middle arrows are right, this means your rest is right/in to far. Give it a try it only takes a couple of minutes to try it. I find its the only good way to get center shot right.
Now what if i have to move my arrow rest and i don't get a bullet whole in paper? This is the spine of the arrow causing the tear. If your nock is tearing to the left (I would assume you are a release shooter) This means the arrow is stiff. Now you can add weight to the point on the arrow, add draw wieght to the bow, go to longer arrows, or go to weaker spined arrows (The arrows might me so stiff that you cannot fix it with the others). If the nock is tearing to the right, this means the arrow is weak. To "Stiffin" the arrow, take off draw wieght, shorten the arrows, decrease point wieght.
Once i get a bullet hole i shot bare shafts to 20 yards. If they (bare shafts) hit low lower then the fletched shafts, either lower the nock or raise the arrowrest. Opposite for high bare shafts. If they are left they are weak, see above for how to fix a weak arrow. If they are right they are stiff. Once they are shooting with the fletched shafts at 20 move to 30 then 40. There are some things to remember about arrow spine. It canges with the weather. You are going to need to add wieght to the bow for cold conditions (Like hunting from November to the end of season) I have to add about half a turn to each limb bolt. Just a thing to keep in mind. I really think this method works. Give it a try. It takes 10 minutes to shot the walk back. If you see a C shape of either sort the rest is off, if they are straight you are good to go. Reply if you have any questions? Good luck hoped i helped.