if it was one concentric ring they'd wear a groove into the plates and run that one section dry. The asymmetry also helps them lubricate. The full fiber pads had sipes. I think the concentric rings of Nick K's performance clutches wound up being one of their weakest points.
you could probably get them relined for like 30-40 bucks apiece and fill in more of the surfaces, that might be kinda cool. or if you're very bold - reline em yourself. maybe you can beef up the engagement that way?
I think that style is thicker? so no converting to a 7.
also 2 speed! sweet!