Don't worry about the Center to Center distance so much if you can keep your belt deflection where it is supposed to be. Remove shims from inside the secondary to get the belt riding high above the secondary (Within reason) This should put your belt deflection back within spec. Make sure to keep your offset at 5/8", or use the Arctic offset tool. Note: With the track tension set to the proper 1" or so, the track when elevated should want to move a little when the sled is idling. That will let you know that your belt is set tight enough.