Inconsistent Depth of Cuts

Skimmed the waste board and all look good. Although the X and Y deviated off the waste board lines while traversing across the board. So I need to get that squared up. I did find an old post at below link by Dave Brookes that matches my same problem, as I have had this happen with lettering as well.

Dave posted the below remedy:

“Anyway, late yesterday I put the
meter on the pots and found that the Y & Z axis motors were way out of
whack. Now with those two running smoothly, the spindle sounds a lot better and
is carving at a steady depth. I spent over 20 years working on heavy equipment
so this remedy confuses me, but it worked!! Ockham’s razor. So thank you for
that video on adjusting voltage to the stepper motors.”

Ill try to get that figured out.