I've found paper tuning is a good way to get a ball park estimate starting out. I've had mixed results with bareshafting myself, but I still try to do it. If a shaft with feathers is making a bullet hole at 6 feet through paper, it's pretty well close. I know it's still possibly in paradox, but, especially carbons tend to have a shorter paradox than wood and aluminum. Main point is, one way can be better than the other, but everybody is different. If you are getting bad tears with heavier points, you are most likely weakening the shaft to much, the arrows you are shooting may be right about spined or right under all ready. Try both, no harm in it unless you hit the neighbors cat or something.