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I don't own a Naniwa so I'm sure others will correct me if I'm wrong but I understood the warping issue happened as a they dried out and was worse if left close to a heat source such as in sunlight...

I'm still new to honing but the the King 1/6k combo seems to work well for me. I've also been looking at that 3/10K combo myself thinking that it would provide a nice progression; 1,3,6,10 at a good...