I'd have thought the alignment place would have an idea. Did they run out of adjustment ability and not get it in spec? What parameter was off? That should get you started.
Those are directional tires, be sure they are turning the right direction Probably are but if one is correct and one backwards that might create a pull if the friction forces are different?
Any local indy shops that specialize in BMW's? What size town / what town or city are you in?
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