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Yeah - I've read that a lot of people prefer the Chrome Oxide paste over the diamond - the cutting particles are smoother which gives a smoother edge. I mean, once you start talking about 0.5 micron...

I think Jordan's advice has got you pretty well covered. Probably a Coticule would be a good edge refresher (an irregularly shaped one, a Bout, is generally cheaper) , or a barber's hone off ebay, or...