Lap it somewhere between 220-400 and don't burnish it. If it feels too rough on the feedback(I doubt it will) lightly condition it with a bbw slurry stone or a soft washita. I don't notice much difference in edge feel from a burnished one and non burnished one but how it cuts and gives feedback will be pretty different. I think over lapping/ burnishing is part of why so many have trouble with hard Arks. They will cut steel, some relatively quickly, though I see people say they don't really cut. The touch you use(pressure/ torque) will be important once you rough it up, as opposed to just feeling like you're skating on glass, but if you're using mineral oil you won't have problems.Ah, as you say - I'm sure I'll come round to it with a bit more practice and understanding! My main problems are the speed and that I find the feedback extremely difficult to read, especially using oil. And because I have dozens of other types of finishing stones that I find easier - I've never really put a massive amount of time in with the arks for razor honing.
The majority of sharpening I do is freehanding knives from blue paper steels, and the black is really not very good for that, whereas white translucents I think can be. I was just being slightly flippant in my first post . I don't doubt at all that they're very good indeed for finishing razors, once one has the knack.