Hi Tim,
We were hoping the orientation would be stored in the image file, the locked solution is not the one for you. Drone GPS is prone to inaccuracies, as indicated by the orange lines from your cameras on the screenshots. By far the best solution for you would be GCPs, and the second best to iron out some of the inaccuracy would be a grid flight path. Probably the easiest fix in your situation would be to set the ground plain to level the model out if geo-location is not as important.