Yes our wife racket be it the NF800 Pro or the LN X880, the shaft is ultra stiff. For me it takes a tow on my play. Thats why due to the stiff shaft and high price, I won't be buying it anytime soon.
Astrox 100 game is fexi shaft. So the X880 is almost to the max of the stiffness range. I suggest you try the NF700 Pro or Tour. The shaft is mid stiff and racket is light and fast. I was using 5U. Ok but lack some power, maybe u get the 4U? But if I'm not wrong the 2 female doubles from China and Korea are using this Pro racket and in 5U. They don't seem to have any issues with power. So is likely my lack of skills.
Fast racket from other camps like LN will be the Blade X Speed or Power, never use these before though. Victor will be the Auraspeed series. I like the 100X Ultra 4U, abit head heavy, stiff but due to the thin 5.8mm it bends abit more? I like it, until my injury so I using lower end stuff now.
After awhile I find more difficult to justify myself from buying high end rackets. Price getting higher every month, then the improvement is marginal or sometimes just gimmick. Not to mention not all players at clubs are careful. So are just too gunho or silly. U know at social club, every now and then u will have a newbie with a Decathlon racket, player will wanna swing at everything. Imagine a clash with u new shida x880! Anyway I digress.
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