Several years ago, I tried bare shaft tuning with my compound with several different arrow combinations. At the time, I didn't see any difference in the bare and fletched shafts. So naturally I didn't bother with it any more.
Saturday, I was practicing at 30 yards and damaged two vanes on one of my arrows. After stripping it, I put it in my quiver, again, not expecting to see any difference in the flight. Well guys, if I could throw a baseball with a curve like that arrow, I could pitch in the majors, even at my age. It hit 11 inches left and 14 inches low!
I stripped the vanes off of two more arrows and was able to shoot two separate and very nice groups with the same point of aim, just 17 inches apart.
The bow had been shooting pretty good so I hadn't checked the tune recently. It was a real shock to see how far out it had gotten.
It only took a few minutes to adjust center shot and nock height to get the bare & fletched shafts shooting together. I checked it through paper and got bullet holes at all distances with no further adjustment.
I'm now convinced that this is a valid tuning method for getting centershot and nock point. Give it a try. If your bow is out by very much, it's kind of fun watching the bare shafts fly weird.