B-heads barely ever fly the same as your field points unless your bow is very well tuned. If you bought your bow from a actual shop, I would go there and have them help you paper tune your bow. If you didn't you still can perhaps call and see if you can stop by and get some help. That should at least make your b-heads fly consistant. If all else fails just make sure your b-heads are flying true and then adjust your sights to them and you'll be good.