I totally agree with this. This is what I have found too. My bg65(27/29) falls to about this if I leave it for a couple weeks with a couple uses(1090hz) but it still feels as tight as a freshly strung 26/28lb job if not tighter but a freshly strung 26/28lbs ping a lot higher(absolutely more tension than a 24lb racket fresh which the hz might suggest). I also think we are missing something when using frequency. Would there be any other reason why settled older string ping's this low?