Combining PPK Data with GCPs for Increased Accuracy - AT Settings Questions

We are attempting to register our CC model to accurate GCPs that we have evenly spread through the model.  In addition, we are utilizing PPK to improve the quality of the model in general.  However we are seeing inaccuracies when querying the model and comparing back to the survey GCP of between .1-.5' (mostly in the vertical) after the model is complete.  I want to confirm that we have the proper settings when running AT and that we aren't skewing the model by the settings we have selected.  

Here is our workflow currently:

1. Import photos with camera calibration & corrected photo positions from PPK software
2. Run Aerotriangulation with the following settings:
   1. Positioning/Georeferencing: “Use photo positioning metadata for accurate adjustment (accurate metadata)”
   2. Settings:”Keep camera calibration
3. After completion of this initial Aerotriangulation, the GCPs would line up very close to the actual targets (within 3-8cm).
4. The GCPs are then selected in the photos.
5. Aerotriangulation is ran AGAIN, this time with the intent to register to the GCPs with the following settings:
   1. Positioning/Georeferencing: “Use control points
   2. Settings: "Keep camera calibrations"

There are a ton of different combinations of options under the Setting tab for keeping, adjusting and computing various options.  Can I get some clarity on these and when to use certain options?  Specifically it would be nice to critique the above workflow.  Thanks!

This is the tab that I am mostly referring to...