recently obtained another Coti at a flea market. This is the third one that I've had no luck with. I lapped it up to 1000 grit wet-dry. Had a rough feel but I tried it anyway with lather and then running water to refresh a razor. It shaved but was rough. The scratch pattern looks coarser than my 1k Naniwa. I was sure it was used as a razor hone as it was in a box including a Swatty. Is this normal for a Coti or is there something else i need to do to to prep the surface?