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You want the 1k to remove some metal and get the deep sub 1k stria. Re-set the bevel on the 1k, with some pressure and circles and finish with light x strokes to lay down an even 1k pattern.

Joint...

Yes, that can be a common problem with Diamonds, especially if using the 325. Edges don’t get really straight until after 8k. But if you have the bevels flat and meeting, joint the edge on a 1k and...