Let's ditch persistent ring hotspots entirely by reseeding them on the daily tick or weekly server reboot. Any grouping of ring material would be temporary as inner material would orbit faster than material farther out, not to mention density waves and spokes, etc. Hotspots would "smear out" over time like scrambling an egg, others would happen to come together before themselves being pulled apart, etc. So reseed them on a regular basis and count yourself lucky to find a temporary double- or triple-hotspot while out mining.