I just ordered an X1 sDrive which comes with 18" run flats. Although I like grippy, planted rides, I find the ride of the 18" run-flats a little harsh. Is there a way I can get a more forgiving ride? Like get a different kind of run-flat? Or asking the dealer to replace the x-line tires with non run-flats (and if so what kind)? I love the look of the 18" wheels but am not a fan of the RF tires. Suggestions appreciated!