Hi Eric,
This is called a tramming issue. The best way to tram a router is to buy a tramming tool like this: ++https://www.machine-dro.co.uk/edge-technology-pro-tram-system-with-1-2-inch-shank?gclid=CjwKCAjw19z6BRAYEiwAmo64LcDq103vQIee9hBPDdivHumNGM3jkVzU9yMvC7jFDnx-ylJaJjVNQBoCzwcQAvD_BwE++
This will measure how much out of tram the router is. You can make your own version with an indicator dial on a rod.
To Tram the X, this can be simply done by moving the router mount up or down on the left or right side. If you use the Height Reference tool, this should get it perfect: [guide|134|stepid=653]
To Tram the Y, also known as the nod, is more difficult. Minute adjustment is needed. Therefore adding something as thin a tin foil underneath the top/bottom of the Z-Bracket to get the correct adjustment would work.