Demos or not, you bought your Sophias new w/warranty from an authorized dealer, and they owe you a better setup than 30 minutes and 6" from the back walls. I recommend you read every Stereophile review of Wilson speakers you can get your hands on to get an idea of what a Wilson setup is *supposed* to be. Several are at
http://www.stereophile.com, including an
extensive review in 2002 of the first-generation Sophia. Then I would contact the dealer and give them a second chance to do a better setup. If you don't get cooperation, warn them that your next step is to call Wilson Audio Specialties. It's well known that Wilson dealers can lose their franchise if they don't do the factory-prescribed setup on every new pair of Wilsons they sell.
Most of the S'phile reviews have a detailed write-up on what the Wilson guy did in positioning the speakers. In the Sophia review, Peter McGrath positioned the speakers 56" from the wall behind them. Wilsons are also often positioned wider and with more toe-in than is typical. The more extreme toe-in helps diminish the side walls' influence on early reflections (IIRC).