Spin an arrow w/ the BH on, on your finger, if you feel ANY noticeable wobble, swap BH and arrows, if you still notice wobble at all, I'd switch heads. For some reason some of the Muzzy heads over the last few years have had issues. I don't personally like a WB because I think ANY fletch contact is bad, but uniform fletch contact is better than a single fletch getting contact. If the arrows all spin fine, you can start making fine adjustments to your rest and or nockpoint to get those field tips and BH's together. If BH is hitting LOW, then either lower nockpoint or raise the rest, using the berger hole as a reference, can help a little. If the BH are consistently hitting LEFT, then move the rest ever so slightly to the right, and try again. THESE ARE FINE, FINE adjustments, 1/16 - 1/32" at a time, and re-shoot. You may also before you even start want to do a walk-back tune on your bow to make sure the rest is CLOSE to being centered. But if you're shooting FP's well out to 35-40yds, your rest should be close.