I need some suggestions for filling out the bottom end of my sharpening kit. I have most of the Chosera stones starting at 400 grit. I wore out a 120x diamond plate thinning out my Takeda and I find that the 400 stone takes quite a long time to get the scratches out. I am specifically interested in how ultra-low grit stones compare to diamond stones. I'd also be interested in what might be a good transition between an ultra-low grit and my 400.