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Your comment about de-carb at the edge brings back memories of my most hated by professional honers razor. It was too hard and finally got to a point that it honed well. But a lot of hours on the...

With Russian razors, make sure they are a hard temper..some were not. Any steel, carbon or stainless, needs to be sharp at 1K. Do the work there! It may take more pressure but do it there.
YMMV...