The manual is telling you when the clutch is fully hooked up. Those of us who have been riding the VTwin awhile like to shift at higher sppeds . Some like the lazier life at 4000, some like to let the 998 wake up a little more and shift at 5000/5500. I shift mine at 6000 and cruise at 5000. That translates to about 70 mph on my spyder, which is just right for me. As long as you stay above 3200 so your clutch stays hooked up you can do what u like. As far as rolling off the throttle to shift ,no it won't hurt any thing but it may confuse your computer as to what you are doing as the recommended way to shift the SE5/SE6 is to not roll the throttle back but to just shift.