So I currently have a coticule and a hard black arkie and a few others but they are hardly used. I am not really using the hard ark because I havent quite cracked the code on it yet. I feel like there is too big a gap in grit range between the coticule and the ark and on top of that with the arkie being such a slow stone that its not worth it to use. I have read that you should get a fast stone of equal or close grit to the arkie and do a lateral jump and basically just use the arkie to polish and smmothen the scratches from the stone into a wavy scratch pattern.

My question is what stone would you suggest to go between the coticule and the arkie. I was thinking a naniwa 12k but thats just what I was thinking and am open to suggestions.