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Its time for me to replace the wheel well plastics that line the inside of the front fender, and I'm sure a lot of you have already had to do the same.
Just a thought....there may have been sound insulating material inside the door which was not replaced during and after the repair. If it were me, I'd take the car into a reputable body shop and ask them to check the interior of the undamaged door, and then compare it to the repaired side.
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rockauto.com sells aftermarket replacement pieces if the OEM ones are hard to find or too expensive. I have sourced them there for coworkers cars before, never looked for the Z ones though.