hy broby
i understand the meticulosity and patience required for your approach; of course, going rough or smooth depends on setup
as for smooth measuring, i use the method described in attached image, when small tools are there, or when i can't use the setter; method's accuracy depends on dial indicator, and it can easy reach <0.01; in comparison to other metods is not only faster, but also accurate
using the part as the reference surface, it will go over any errors that are related to probes, as this method is faster than probe calibration, etc
this works, yet it requires many keystrokes : G0 Z0 H...; i check within 1 keystroke : after reset, z value has to be equal to tool offset, mill and lathe