Graphene 360+ Prestige MP vs Graphene XT Prestige MP. Stats, according to the TW racquet comparison tool: Same static weight (360+=11.9/337g, XT=11.9/336g), same balance (12.6=32cm), but SW is 360+=323, XT=317. Why? Is this measurement off? Also, the 360+'s RA=61 and the XT's RA=65, but the Power % is 360+=41 and the XT=40. This also does not add up to me. Doesn't stiffer equal more power? They both have a 16 sq in sweet spot, so that's even. Now, I know these stats are fairly close and with quality control issues may be statistically irrelevant, so what is the real difference between how these two racquets play? Do spiral fibers make that much difference? If I can find a used XT, why should I buy a 360+ Prestige MP? What accounts for the difference and if you could, theoretically, do a blind play test, what would you feel different about each racquet? Are they different at all?