Questions:
1) Racquet's "Recommended Tension" is 55-62 lbs. Is that the "String at" or "Use at" tension?
2) My tennis teacher told me to string at 60 with TNT FatCore 17. RacquetTune showed 61 lbs when I picked it up, lost 11% (54 lbs) the first week, down to 14% (53 lbs) the second...