I'm a ~4.0 player who hits with a semi-western forehand and 2-handed backhand. In years past, I usually broke strings after about 20 hours of play when I use a multifilament or a more playable solid core synthetic like Gamma TNT. Recently, I've been playing against more advanced players and hitting harder than in previous years. My last 2 string jobs were done with Gosen OG Sheep 16 and Wilson Sensation 16--both went mushy after about 12-15 hours of play, so I cut them out. My swing speed is medium to fast, depending on who I'm playing against. I just did my first hybrid string job 2 weeks ago with Topspin Cyber Flash 17 on the mains and Gosen OG Sheep 16 on the crosses. I like the increased control and spin I've gotten, especially the spin when I swing fast. So I started thinking about trying out some MSV Focus Hex 17L or getting a reel of the CF. But I just read in J011yroger's guide (http://tt.tennis-warehouse.com/showthread.php?t=184942) that polys don't maintain their playability very long. If OG Sheep and Sensation lost playability after 12-15 hours, how long can I expect this CF hybrid job to maintain playability? Given my playing habits, is a co-poly main hybrid with solid core synthetic the best way to go for me, or should I be trying something different? I'm looking for a setup with optimal 1) control, 2) long-lasting playability, 3) spin potential. Your input would be really appreciated!