I just got a k90 to demo yesterday and absolutely love it. The weight in the racket forces me to not over hit my shots and causes a severe increase in consistency (yay!). Also the angles and precision you get with this racket is astounding. My only concern is I feel like I have a slower racket head speed or swing speed then the ksix team and ksix 95 i tried (especially the ksix team cause its so light). Think this is due to arm strength? Is it something I should be worried about?