1)I bare shaft at 12 yards first, once i get em straight i can bare shaft out to 20 with no problems. this has always been my experience.
2)The shafts I'm shooting now out of my primary bow are week, they bareshaft week everytime and I can't cut them any shorter. When fletched they fly like lazers, I know they are week only because I bareshafted them. If I was hunting anything but turkey and whitetail with this bow(pigs, moose, elk, dinosaurs, elephants, rhinos) i would get a stiffer shaft and start over but for the thin skinned whitetail and turkey they fly perfect fletched and i have KME sharp razorheads to compensate for any "wobble" i can't see.
hope that helps