TW rates the C10 Pro as a Low-Medium Power racquet. The USRSA Power Index (on tennis.com) for the Volkl C10 Pro is 1762, which is one of the lowest. A majority of racquets categorized by TW as "low" have USRSA Power indices significantly above 1762. Can anybody explain? Are there different versions of this racquet? I'm demoing the C10 Pro now, and it does seem to offer a bit more power, that's why I was surprised at the low USRSA rating.