From what I have read, the axis will migrate on a line that has a similar RG as the initial PAP, and can't go to a higher RG.  That being said, will moving the pin say 4 inches above the fingers on an asymmetrical ball change the axis migration and ball rotation/roll differently than a pin in a similar location on a symmetrical ball? Is an axis migration path that goes down, across, or up better than one of the others?