Running M390 that soft is absolutely pointless. Hinderer is learning this lesson now too, after both Spyderco and Benchmade dealt with it a year or so back. Guys like Outpost76, Supersteel Steve, etc. have done cut tests and soft M390 doesn’t even outperform S30V. So, if the blade steel is at a sub-optimal range for HT, why even use it? What’s the point? There’s dozens of other steels they could have used with high toughness at lower HRC. But taking a highly wear-resistant steel like M390 and running it out of spec is just ridiculous. Chippy or not at that range, you might as well be running S30V.