Z axis perpendicular issues

Surfaced the worktable with a 1/4" endmill, all I had lol and there’s spots where it’s not perpendicular. it digs more on one side than the other. What’s the best way to adjust?

pictures attached for reference


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You can use any tramming tool, bent wire, or I have a printable perpendicularity tester on printables. Use that to set and to test while you shim the tool mount with layers of tape, or anything thin. It should not require much.

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