I had 20-30 class 10-15 planets near my homeworld with abundant / abundant and abundant / common in beta 6, but only 10 or so on common / common.
   So both settings impact the frequency of habitable planets.  If that is the case, star frequency would also impact total number of planets.  I have Occasional star / uncommon extreme.
   Seeing far fewer class 4-8 and 16-21 as well.
   But I have only generated a few maps, not dozens, so it might have been rng.  Gigantic map, not near the edge, loose clusters.