Ok i like poly for my topspin groundies and serving, and of course the sound and i think the feel is subjective but i like that too. Anyway, whenever i get a short ball i cannot put it away with the same authority i used to. When using a string like PSGD for example i can put the ball away no problem but w/ the cyberflash i am getting too much spin and not enough pace. Would lower tensions help? a different string?