The headlights are great (for non-Xenon), so I would assume that your car has an adjustment issue that could be resolved by your dealer.
On my Jetta TDI I can "play" with the light adjuster to the right of my steering wheel to make the "black " area as you describe, appear or disappear. Maybe your lights might be out of "standard alignment".
headlight aim can be adjusted with a screwdriver at the light. There are rules about where they point, especially height.
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