Since you are doing tag insertion there is a pretty good chance that things are off by a decent amount and this seems to have cause the model to rotate. You can see in the elevation layer that the whole mode is rotated a bit.
The white spots in the overlap report just reflect that there were not features matched there. This isn't surprising though since that isn't an area that was matched when creating the model.
To be honest, this is pretty good for using such a camera. The focal length in the tags is not the issue. Inserted tags will never be as good as natively tagged ones.