If the values from the front to back differ by more than 0.0005", make small and equal adjustments to
the middle leveling screws.
If the spindle sweep values come back into tolerance with only small adjustments to the leveling screws
then there is no need to recheck the twist and bow.
For a more in depth guide on how to perform a spindle sweep test on your VMC please see:
VMC SPINDLE SWEEP