It sounds like you've moved onto a different problem, this isn't a use of the duplicator wizard.
If you want to snap CPs to the grid exactly, select them, >Snap to grid.
That snaps in all grid dimensions however.
If you need to align a group to just one coordinate, select the CPs, set its pivot (found in properties window) to the place you wish to move to (say, x=10), then scale on X to 0%