That sort of misalignment would normally be within tolerance for most car makers - but not for members here!!
I had a few issues with the bumper (seized retaining bolts; trim clips; split trim between bumper and boot cill) and have spent some time trying to get perfect alignment. Part of the issue is that the bumper is not rigid and will try to fit whatever shape is best for it. The plastic retaining clips onto which it slides do have some adjustment but not SFAIK in a transverse direction. Mine suffers from the fact that I can align the trim with the boot cill for a nice fit but the bumper wheel arch section protrudes forward of the body panel comprising the upper wheel arch. 
Sorry that that is not an answer to your problems but i do feel your pain 
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2002 D2 S8 – Ming Blue, Valcona leather, Vavona wood insert, solar sunroof (to be fitted), Heated rear seats, extended leather pack, 18” Avus, ski hatch, Bose, auto dim rear view mirror, rear blind.
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