String and tension dilemma for this frame: My last experiment was using TIMO 17 @63lbs. Started out great, but after approximately 4 hours, felt considerable tension drop along with springy feel and ball started to sail! Specifically, I'm looking for something more crisp to avoid that annoying spongy feel. Current strings that I have in my bag are: Babolat Pro Hurricane 16, Prince SG w/Duraflex 17 and Tecnifibre NRG 18. Would appreciate feedback on your thoughts and experiences! Brief summary of my game: In between 5.0 and 5.5 (getting older), lefty, strong forehand and serve, mostly slice backhand, all court game. If comparing game to known player (Feliciano Lopez). I was a long time user of the PS 85, but decided to switch to something a little more forgiving over a long haul match (South Florida heat!).