It sounds to me that you have made a mountain out of a molehill. Have you aligned it and rotated the tires? They're not paying for it? Right, I would abandon one of the most dependable brands on the planet because of that . Good Grief Man!
You have carried this out to WAY beyond the minor fixes that would have immediately corrected the situation. It is all so far out of proportion that your gripes are both preposterous and humorous. I feel you would not be satisfied with a new Bentley GT if it were free.....you would bitch about the color!
By all means please trade it in on the shop friendly Bimmer. We will ALL thank you.
. Good Grief Man!