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Heat treating and tempering are 20% science and 80% black magic. There is not a single 'correct' way... there is a way to get maximum hardness out of a specific steel, and a way to soften it...
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I would recommend getting in touch with one of our other European members who is known to be a profiecient honer. Your razor has very good steel, and should hone up very well in the hands of someone...

Any of the honemeisters from SRP ought be able to sharpen a fine razor like that, no trouble at all. Who did you take it to?