Not experienced with AWD but I'd be looking for a second opinion. Maybe look for an independent mechanic that has experience with BMWs and their AWD systems. The mechanics at the dealer are sometimes hit and miss.
Sounds like you've narrowed it down to a corner, that's not easy. Is the vibration dependent on road surface? or consistently just rotational speed of the wheels? I wonder if if the tie rod end is loose causing the clanking... Hows alignment? Does the car at least drive straight?
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