When stringing up a brand new racket, is it normal to lose more tension than if the racket has already been strung a few times? Here's the background for my question: I strung up my 2 brand new Speedport Blacks with the hole inserts about a couple weeks ago. I strung them at 63 with a co-poly. After about 3 matches on each stick, I noticed they had lost some significant tension. I tested the strings with my trusty Stringmeter and noticed I lost about 12lbs from my string job. That is way more than I usually lose which is about 5 lbs before I break them or cut them out after about 4 weeks of play. Same stringer, same stringing method, same exact string, same tension, same stringmeter to test the strings, but more tension lost.... Is the rackets being brand new a valid explanation or did some other variable creep in?