I find I can't really see what a bare shaft does for being correctly tuned until I get out about 25 yd. or so. Less than that and a lot of combinations fly to about the same place for me. Particularly with high FOC carbons. I can't shoot so accurate I can tune 1-2" low when I get that far out most days. I can shoot 6" groups some days, but the bare shaft will mix in. So I look for a bare shaft that flies a hair weak and then fine tune until it is in the group at longer range. I also shoot out to about 35 yd. When I see a shaft that most times flies about in the group, flies a hair nock high and weak over that distance, and gets all the way there without correction where the shaft swings around, I am good and my broad heads fly well. In the end I always end up fine tuning with the BH anyway, but this gets me real close.