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Not exactly. It just depends on how close it is. If it's really sharp but harsh on the face, then you'd be better off spending some quality time on your strop. If the edge is just starting to fall...

If the razor is close, 15 may be a bit aggressive.... One of those ymmv kind of things. You could always give it 5 or 10 swipes on the 8k and then refinish on the 12k and see where that gets you.

Lately, if I'm taking a razor that is near shave-ready back to the hones this is what I've been doing. Starting with the Norton 4/8, I do the following pyramid with NO PRESSURE, 15/15, 10/10, 5/5,...