nblade vs speedport vs k blade

spiritboy3

New User
i want to change to either k blade or n blade but whats making me concerned are the 58 stiffness from n blade and 65 stiffness for speedport and no idea of k blade except 66 for unstrung. So which one should i change to just concering about the stiffness? i use two handed backhand by the way.
 
the red one but i mainly want to know if the stiffness matters alot and what would be the closest spec if i choose either k blade or n blade.
 
my coach was so giddy talking about the new kblade. he used the PC 600 for many years until wilson, his sponsor, got mad at him. He then switched to the K90. But he was practically giggling when he told me he would be getting some next week! lol
 
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