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I cannot give a proper assessment of that. I have not used it very much for lapping, only for occasional razor work and a few trials for lapping but like you only did it for finishing the lapping.

I have the Atoma 120, 400, and 1200. Given how well the 400 works, I would guess that the 600 would be just fine for lapping; and of course it is more fine than the 400.

The 400 is amazing for...

The DMT 325 used to be the only thing any of us knew, so it was what was/is recommended. There are better options now. I will try to start a new thread about this soon with explanatory photos.

It simply takes a purchase to make the Atoma 400 optimal for the purpose.

Yup. Many have made this same discovery. Even if is worn out it will still be a good substrate for sandpaper.