Not so much, it wasn't completely taken out in the first place. After looking over the rest of the bumper with those plate tags and all, I decided that it was good enough.
I should have taken more pictures of it with before and after repair.
I went back to look at the pictures, you maybe can't tell from them too well, but it's much better than it was. It is a fairly even dip on the right side as compared with the left side. Right in the middle of the moulding area are two plastic pieces plastic welded on the back from the factory for tags that cause two bumps in the middle and then two slightly lower spots to the side of them.
I do see a dip in the lower grill area I might address though.
I went back to the picture of when I first primered it (your post had me worried!), the waves there are mostly from the stand it's on. The plastic is soft, that's for sure. We have other bumper stands at work that will support it better that I'll probably use when I paint it and it goes through the bake cycle.
I'll take more pictures of the rear bumper when I repair it. It has a dent on the left side from a tree growing up against it. I'll be more particular on that one. It seems to be the bumper that really needs to be straight.