Could somebody recommend a good string/tension for a Fischer M Speed 105? I'm looking mainly for comfort, feel and control. Besides the type of strings, what it's correct 1 piece or two stringing? I bought one strung with main Gosen Polylon SP 17 @ 60 pounds, the crosses are Gosen OG-Sheep Micro 16 @ 62 pounds. I'm concerned because I read here from the experience of others that this could alter the shape of the frame. Thanks in advance .