I ran a square and circle test in aluminum on my HDM, the square is 20x20mm and the circle has a diameter of 10mm. The results were pretty much exactly 1mm oversized. I used two 2d adaptive tool paths in fusion 360.
Just for future reference digital calipers can be unreliable when the battery gets low. If you measure the same thing multiple times and get different results change the battery before jumping through hoops. FYI
You’d create a separate toolpath for finishing.
In your case a simple contour path would probably do it. Adaptive toolpaths aren’t a great finishing strategy, and leaving some stock intentionally allows you to come back and finish without the same cutting forces for deflection to be minimized.