Bumper is looking great. I put a 1" piece of strap under the tail gate when I built my Luke bumper to finish it off. I felt like the rear area was "unfinished." It covers up the lower body area. Of course when the tire carrier is closed, it doesn't matter, but I knew it was there.
You can kind of see it in this picture.

Jack
You can kind of see it in this picture.

Jack
I was planning on adding a piece like that and tying it into the curved pieces on the sides. That gap wont stay there, cause like you said, it sticks out like crazy and makes it look unfinished.