Hello Terrence,
To improve the accuracy we recommend to optimize the camera alignment based only on GCPs (with camera coordinates unchecked in Ground Control pane, and with the marker accuracy set to 1-5mm in the Ground Control pane settings).
Also it is recommended to use 5-20 millions as face count parameter in the Build Geometry dialog, since low values (like 200 000 faces) may result in very rough geometry with huge polygons.