I had TF Black Code 17 installed in a full set in a 100sq racquet at 62-63lbs. I realize that reference tension will not be the same as practical tension after stringing. I hit 1 hr with it against a ball machine at mid speed settings. The next day my string meter came in and I checked it at around 58lbs on both center mains at the mid point (the stringmeter guage said it was bordeline 16g/17g so that's where I set the dial at). So, after two more hours of playing against the ball machine and a couple of weeks since it was restrung, it still says it is around 58lbs. I really thought it would drop off more. But it didn't. Is my string meter right? Or am I expecting more drop off than I should be?