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Sic powder progression?

What is your method of flattening your Arkansas stones with Sic? I have seen a few stop at 320, others go to 600 maybe higher, then switch to w/d paper. One members video shows 60/120/220/400/600 , with 60 for extreme work. I have several stones on the way and plan to at least lap them or possibly flatten a few . Got grit stops at 500 grit. I think his glassworks stops at 800 grit. Amazon has a 9 bottle set from 60 to like 2000 for everyone's reference at 45 bucks.. A lb of 120/220/400/600 comes to 35 after shipping from his glassworks. Just curious on opinions.
 
I'd likely stop at 220 or 320 and move to W/D for the finish.

Lens and mirror grinders go higher because they are not lapping flat surfaces and can not use W/D.
 
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