At the moment have naniwa pro up to 3000 then bbw and coticule. (Still struggling with size of small thuringian). Am getting decent edges but often have to jump back down to 3000 if I mess up a stroke or two. Was thinking of an 8000 grit naniwa so I'd only be finishing on the coti. In Germany for the winter and German amazon has the 2cm thick superstone with holder for the same price as 1cm thick specialty with no holder. Was wondering if there was an appreciable difference between the two?