18's will def clear the caliper. It is tight, but the wheels move freely. If you are using an OE wheel, which you said you are. The wheel weights are a pain. Honestly, I don't run em with the weights cause they end up flying off anyways.

As for the lights. I concur with the SAS being off. Just for a giggle. Try turning your wheel full lock left and then right and then center to recalibrate on your own. The transfer fault might be because the plastic gear is shot on the one side. All that would need to be done is flipping the gear 180* and you're done.

Tire shops will use lead weight tape to balance a tire, better shops will have slim weights. If they don't, you might have to bite the bullet and go to the dealer to have them put the super thin weights on. They taper from edge to edge so using those should clear.

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2011 E70 50i M Sport