I use this page for a reference page.
https://en.wikibooks.org/wiki/Bicycl...ing_Dimensions
However, as you are seeing, shifts aren't entirely consistent across the range.
Keep in mind that Campagnolo changed their shift ratio mid production of the 9 speed.
I had thought of using a laser pointer to measure movements, but you undoubtedly get much higher accuracy with the dial indicator, as long as it doesn't impact shifting.