You can absolutely shave off that stone, with nothing further. I had that stone for awhile, it was a good finisher. You just need to really make sure your bevel is set well, and be very light on your water-only finishing strokes. I'd highly suggest stropping on natural linen afterward before leather, and if you must cheat, pasted strops will allow you to shave off a 1K stone, if necessary, so they of course will help your edge off your kitayama.
Most guys buy into the hype of needing a 12k stone or beyond - most of these same guys wouldn't know the difference between a well-honed razor off an 8k or a well-honed razor off a 15k - myself included.
Most guys buy into the hype of needing a 12k stone or beyond - most of these same guys wouldn't know the difference between a well-honed razor off an 8k or a well-honed razor off a 15k - myself included.