[notorious]

I think there is adjustment in the bumper itself it you completely remove it.

But I've adjusted mine the other way. Bumper is attached to two "shock absorbers". Those shock absorbers are attached to "main beams" (don't know the right term) with 3 bolts each. We can reach to those bolts without removing the bumper and headlights. We only move bumper forwards a bit, so it still hangs on its "rails" and operate through the opening. We losen those bolts through the opening and move shock absorbers to upper or lower position. We then tighten those bolts. We don't need to remove bumper to accomplish this.

Hope it helps.