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I have to say, the more I use then Nani 400, the more I like it, and then I use it more... The only thing that does bother me is that it needs to be flushed with water frequently because of how...

It depends on how significant the nicks are. Regardless, you should get a 1k before you start going lower. I have used the Naniwa 400SS and the 600 Chosera. Can't go wrong either way.