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What stone do you use before the Suita?
As far as the DMt, yes get a finer one, 600 or 1.2k should work very well.
As mentioned above Suita stones are pretty aggressive and if you spend so much...

As Sham suggested give it a very good lap and see if you are going to reveal nice clean surface.
What do you use to lap the stone with?
What do you use to raise slurry with?
Have you at least a...