Very new to honing myself so what I say comes from very little experience for what it's worth. I use a fairly complete set of Naniwas ending with a 12000 finisher and some laps on a Crox pasted balsa strop. The edges were good and sharp but were lacking in that smooth feeling. So I took a flier on a Zulu Grey and found I got the smoothness I wanted without sacrificing the sharpness by redoing my blades on the Zulu Grey and a few laps on the Crox pasted strop. No idea why this is but it works for me and I am staying with it. I agree also that the 12000 Nani needs constant flattening for some reason. The Zulu Grey is a natural stone and there is a huge long thread on it in the honing section if you are interested.
Bob