On the subject of which sharpening media to use with the well known knife steels based on carbide content: did you learn anything that surprised you, or anything that was a change to the rule-of-thumb guidance that most current sharpeners follow? The OP sounded mainly consistent with that guidance unless I missed something. Cbn/diamonds for certain carbides that exceed somewhere in the vicinity of 2600-2700Hv (and still in practice, we're mostly talking here about VC in popular knife steels, true?), and other media such as alumina, SiC, etc, for things in that category of 2700Hv and below. Or if that's not the case, interested to hear what nuances you learned for optimally matching up sharpening media with steels.