An 800 grit stone may well be *creating* the microchips. Go ahead and move up to 2k grit and see if they disappear. I've got some razors that microchip even from 4k or 8k hones. I have to hone those a step or two above where I'd hone a normal razor, so on those razors I'll start a touch-up at 16k instead of 4k.