The new rear light doesn't interfear with the bumper at all.
They work together just great.
As for the polishing.
I have deliverately NOT touched the sled for the last year.
Didn't clean it, didn't wipe it, didn't wash it.
I wanted to have a full year on the polishing job to be able to compare it side by side, and THEN do a basic polishing and see how much of it comes back.
You will see those results soon.