GaugeThinner is livelier. Thicker lasts.1.20 mm grips the ball and feels lively, but breaks sooner. 1.30 mm gives up a little response for real durability. Most players land on 1.25 mm.
TensionLower is power. Higher is control.A looser bed is a trampoline: more depth, more comfort. A tighter bed is a board: more precision, more work for your arm. Polyester goes in at 18 to 20 kg, never above 22. Multifilament and synthetic gut at 22 to 26 kg.
RacquetSame string, different frame.Head size, string pattern, stiffness and balance all change how a string plays. Tell Kakos your racquet model so the setup fits it.