I have imported some GCP's and have re-optimized and done the whole shebang. In Pix4d everything is where it is supposed to be. the coordinates in the lower right corner are showing the right numbers. When I export out the .las and import it into anything else the coordinates are no longer correct.
This project has an arbitrary system, but I have even translated it into the Utah State Plane system and still the export files do not coincide.