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That's too bad if they "feel" that soft when sharpening. I sharpen by hand and know what "feel" means. Though a diamond sharpener can make it harder to discern it. An oilstone though will give a good idea of how hard by how easy it bites into the steel. Not scientific, but a knife at RC 59-60 feels like you are sliding the knife across glass more than biting into it unless you use a diamond sharpener. S30V at RC 60 needs a diamond if you don't want to be there all day.
Too bad your cleavers are not differentially HT as that would have made them worth more. 1075 is quite capable of being hardened around 56-58 with good toughness. 5160 is just as capable too.
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