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I don't think most people know that a 4k jump at a 1-5k level is not the same as a 4k jump at a higher level.

I.e a 1k stone is around 16 microns, going to a 5k is 2.5 microns. A 6.4x...

I think you're correct.

Also IMO there isn't much a need to drop to a 1k unless you have some issues you need to fix like chips or bevel issues. And starting with a 1k leaves deep scratches. ...