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No stone will come flat out of the box, ever.

I have used my 1200 to lap other stones but its main function in that regard should be surface conditioning and slurry making. The 20k is the hardest synthetic I have seen, the others are soft...

My 20k stripped half of my 1200, that stone is not to mess with. I'd assume for light conditioning of the surface the 1200 Atoma will work but for lapping forget about it if you want to have a useful...

Mine was within visual tolerance. it laps very easy with my new Atoma 400, it was hard to do much with my well worn DMT 320, or my old Atoma 140.

400 atoma, when new, will take care of the Suehiro, easy.