I am considering buying new frames. I am thinking about some different alternatives that I could lead up to be basically the same, apart from the stiffness, which I can not do much about, once I ave bought the frames. The racquets I am thinking about are for example: - Bablolat pure storm - Wilson ksixone 95 - Dunlop 200, or whatever the blue 95 sqi version is called - Donnay pro one international The wilson is around 10 units stiffer in stiffness index than the others above, according to the specs on the TW site. How relevant are the stiffness ratings in actual play? Would one notice the 10 unit diff? In a way that I get more ball feel and spin from the softer frames?