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Yet my Norton 4k only performed well (before lapping) for a while, in accordance with what I've learned is decent (by honer's life), until lapping. And that was naively given to the factory lapping,...

Not to invalidate you, but...

The first straight-razor I attempted to hone up to shaving ability was a dubl duck "Dwarf". It had some tarnish and a few scratches and it's edge was chipped and dull...