Have read a lot of different information on arrow spine. I have been shooting the Carbon Express CrossBolt arrow and have good groupes. I like the Bohning Bolt Vanes and have re-fletched my new arrows with them. I checked the spine in water with dish soap added, with the odd vane marked on the nock. They seldom ever come up with the same side up so I am thinking that there is no real difference in the spine on any of these arrows. I did put the odd vane in the same position as it was already marked. Arrows weigh in at 472 with 12.5%. Bow is 150 lb Jackal, rated at 315 fps. From a rest it will shoot a 2-3" group from 30 & 40 yds. depending oh how much the shooter moves around. With this, I don't think there is any need to worry about spine in any arrow I chose. Am I right or way off base ? ?