Tried some X-One biphase today strung at 58lbs on a constant pull machine. I have heard so many great things about this string, but it really disappointed me. It was comfortable and there was some power, but I couldn't generate any spin or get any control on the ball. I just had no confidence taking cuts at the ball with this string. I have mainly been using poly/nylon hybrids (spikey shark/gosen micro sheep 17) but had a few issues with my arm, so wanted something more comfortable. Anyway is it worth pursuing this string? Do you think it would respond better under high tensions? Maybe 63/64?