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You'll find it difficult to get a good shaving edge off a 4K stone.

If you have any CrOxide "honing compound" -- used for plane blades and such -- try stropping the razor on a pasted strop. That...

FWIW (from somebody without forging skills) --

It looks like the handle is too thick to let the blade lie against the skin at the proper angle. And (as you know!) your rough-and-ready...