Hello and thank you for the detailed response.
1. I first printed the part that I attached in it's entirety using the default 0.2mm settings. Then I printed the first 6 layers with the engineering 0.1mm settings. Both times I had the same amount of oversize.
2. It's a Snapmaker original printer. It's a neat little machine that allows me to print, engrave, and cut. I've used all three features for my flight simulator "stuff". Got it NIB from a guy on Craigslist for $500. Been wanting to do this for years but the price of 3 separate machine was WAY to cost prohibitive.
I used Fusion360 to built the components and save to STL files.
I used the press/pull feature to make the .2mm adjustments to the file and am now printing it at the engineering 0.1mm setting.
Cura does seem like a very powerful piece of software. You have probably seen this https://all3dp.com/1/cura-tutorial-software-slicer-cura-3d/. I'll be spending some time with it this evening.