After you smooth those piston skirts, mic your pistons and make sure they're still in spec. The heat generated by friction can change the piston skirt shape.
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Quick update: It turns out some of the piston's skirts definitely have more than just "light polishing" marks. One in particular showed some obvious scoring, although most of that seems to have cleaned up after hitting it w/ some 400 wet-or-dry and WD-40. However, the corresponding wear marks in the cylinders still make me think that I should re-hone it after touching up all the pistons.

If the pistons & cylinders hadn't show so much wear, I'd have been OK w/ putting them right back in w/ the same rings. Unfortunately, I don't think that's a reasonable option after seeing things up close.