What contributes more to arm/shoulder disomfort, stiff racquet with little flex or stiff strings? I've switched from a K6.1 with a poly hybrid to a racquet with more flex - MG Prestige Pro - but I'm currently using a full job of PHT in it. I'm still trying to find the right mix, but I love the serves and volleys I get from the PHT. So For example, if you had a soft Volkl racquet but played with a full job of PHT. Is that less harmful to your arm than playing with a K6.1 with full gut? Is it a black and white discussion or does it vary?