the last one I did had that gap to the bumper WITH the bezels in, or shall I say the last one my co-worker did while I peeked over there to see what he was doing.
So it was roughly the same distance to the bottom of the bezel as it is to your bumper to the bottom of the taillight opening. With your bezels in it would appear that there's no gap then, right? If so, that's too high.
My first guess after re-looking at the pics would be the tail light panel? Did you just weld in one? What's different about your decklid fit if so? When my co-worker welded one in there was a slight difference between the gap on the left bezel to bumper gap but we wrote it off as it being the aftermarket bezel.