Hi sctodd,
in your workflow, are you using some targets with coordinates or do you use them just for scaling? When you are using PPI license without licensed inputs, then it is not possible to scale it.
About scaling there is this tutorial: https://www.youtube.com/watch?v=qb4EPyLBRHM&t=19s
Regarding the settings, do you mean Max feature reprojection error?
It is recommended to have mean and median error under 0.5. Also, you should watch the maximal error for the aligned component. This can be achieved using more precise alignment settings, but it seems that you did so.
When your project will be scaled or georeferenced, then you will see also position/scale precision.