Hi I have a few razors, 4 of which come off my coticule with an awesome edge, Kropp, Sprock, Gold Dollar (yes really) and Seehund. The others will shave well but are not quite in the same league as far as sharpness goes Kukri, Hermes, Bassler (inox), Joseph Elliot Wedge, Allen & sons.

I am confident that the bevels and are good and, with the possible exception of the wedge, I'm confident that my technique on the OK razors has been the same as the on the great ones.

I was wondering if a 12K Naniwa superstone is likely to improve the edge after a coti or whether I should just accept that some razors are better than others.