Are you shooting with BH's or field points. If you shoot fixed blade that may require tuning maybe you got the kock vane turned. I always mark my vanes when sighting. Even with field points. Then I always make sure that vane is in the track in the rail. I shoot mechanicals so I am usually good to go once I have all my vanes on each arrow marked(shooting field points). Seems like fixed blade almost always require tuning. Just a thought. You probably already know all of this anyways. Just trying to help.