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how was the edge cutting armhair? was there any resistence?

The 1k stage is usually where i try to get everything i can get out of that hone it may be you just need to take a little further and...

What about if, EPD - just for yourself - finish on the escher after the 1k and see what it adds in terms of smoothness and see how it affects your edge? I have no idea, but it might be worthwhile.
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