Get rid of your 80/20 "camera mount" up top including the uprights, leave the shooter support.
Replace with some of that wonderful lexan you got accidentally.
Look to relocate the battery in the center behind your lift mechanism, instead of at the back of the robot.
Also, consider moving the transmissions and motors forward, in between the front two wheels (instead of the back).
I'm currently looking at small pictures on my phone . . have you guys actually gotten the scale to weigh it yet?
The bumpers will help your top bottom a bit, but you NEED to fix the fore/aft problem.