At present I am using a DMT 600 and DMT 1200 for knife sharpening. I would like to add a finer waterstone. My question is whether to go with a 2000 or with a 3000. I think the DMT scale and the japanese scales are slightly different. For my woodworking I go 1000, 4000, 8000 waterstones, sometimes skipping the 4000, so I have nothing in this range. Recommendations ?