Regarding your numbers. I normally can get the same measurements from alignment to alignment, but i am using the same tools with the same process. The numbers your two shops got were not wildly off. Depending on your setup and how firm your adjustments are made, cam adjusters vs plates and even the stiffness of your bushings can result in significantly different readings. Any pre load on the bushings and your readings are not exactly the same. Worn parts are also a culprit for variability.

Sounds like you made some good adjustments and you will eliminate some variables with your new setup. Im interested to hear what you think of the changes.