It seems to me that only few options afect gameplay. For example I choose defferent number of planets several times, but there are always 5 of planets in every game. Same with habitable planets' - always one-two planets with 6+ class, one with 3-4 and rest is zero. Similar with tight/loose clusters.
And one more cosmetic rant - planets that look habitable(earth-like) displayed as zero-class...here more correctly that zero-class planets displayed like habitable ones.