Good pictures and graphics to show the problem.
I wonder if a collimator tube (hope that's the word I am looking for) would help if too much of of the bumper was in view or the camera.
We would still need to see the edge of the bumper for safety.
A few times I have see this blooming of the display due to sun reflection but there generally is a delayed auto adjustment which could have been me adjusting the car position.
2012 RED Volt VIN:#C-8860 - Premium Leather Seats Jet Black with Dark Trim, Rear Camera & Park Assist, Nav
09/29/2011 Ordered -- 11/15/2011 took it home