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Well as per the video, the razor doesn't leave grey metal streaks on the 8000. It also doesn't cut arm hair freely though, only once the hair is semi-braced against the skin.
I've got the stones soaking in a bucket, I usually do a half hour soak but these have been in water since last night and they seem to grab a hell of a lot better. The C12K shouldn't be permeable, but there's a lot of friction with it and I recall this being a rather frictionless hone... the 8k sucks the blade into the surface, 12k does a little too.
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It still sounds like you are polishing a dull bevel...
You need to set a bevel and test shave to see how the razor cuts. You can shave on a bevel setting level.