single or bi-xenon? If projectors/single xenon then not much more you can do apart from replacing the bulbs and alignment. If bi-xenon they have a reflector that gets dull with age, so as well as potentially knackered bulbs, taking the unit apart and polishing the reflector could be worth a try.
I replaced the bulbs on my bi-xenons a few years ago with correct Audi packaged bulbs and it didn't make a massive difference - a bit, but I'm not sure I'd spend the money again! Replaced the fog bulbs with brighter bulbs and that made a difference 
It's easy with VCDS to screw up the alignment - you're supposed to put them into an alignment mode where you then get them set at the correct height, then do basic adaptation to bring the self levelling back into action. Fiddling around can cause the levelling system to throw a fault every time you drive, which is very dull!
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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