You may have considered this already but there are numerous tire shops that will let you trade your tires in for a different set. Given run flats are expensive, you might be able to trade straight up for some non rft. Or else sell them on cragislist or ebay...IF you are determined to get a softer ride. Running any tires below recommended psi, aside from driving off road etc, is not a very safe practice.-Anyone think maybe the dealer would be willing to exchange the tires on delivery day? It would not hurt to ask.