I am some what new to tennis, been playing competitively in a league for about a year now(Playing over all for 4). I am a Solid 3.0(according to the comp/pro) but play 3.5 to build my skill. I currently play Prince Synthetic Gut at 55#, as that seems to be the go to starter string. I love the feel and pop that the gives and really the overall performance. My only disappointment is durabillity(may not be the right term). Thus far in the last 6 months as I have began to play more in my leagues (2 matches a week, plus 1-2 practice matches a week with friends). I have noticed that in 2 weeks or so my crossed start moving all over. What I am looking for is something with good feel that will help me generate power but would hopefully extend the life of my strings. I am not sure if I need to move to poly or maybe just move to a different Syn Gut or possibly a multi. Any advice would be greatly appreciated. Thanks in Advance.