The software that comes with the colormunki photo is actually pretty decent.
I’d take it over fiddling with the video card controls on my computers. Try to do multipoint … then put up a ramp and see how awful it looks. I did one pass with the munki and it looked comparable to the Sony display I use as the main computer monitor in the system. That is just a TV and I did the calibration with the custom area like all sony sets.
I don’t know how the xrite i1 pro software works though …
Regards