OKIt was more about a case study. Zroni are exceptionally rare and irassians are the exact opposite. Now you said you play with the same settings like me and maybe this is the problem. If you're right and it's directly matched to the amount of planets in your immediate area around your homeworld it would be a explanation for that. (And the only way so see the settings as far i know is to look at the screen before you start a new match. The last settings are luckily saved).
So I gave my experience earlier. I didn't encounter any problems.
Settings: Normal number of AIs, no advanced starts, number of planets 0.75, usually admiral difficulty and no mods
I don't think the zroni spawn addtional habitable planets so I assume their sites will only spawn on the planets determined by the settings. Having an extremely low setting like pttaylor could result in the problems he described. This is all based on my limited understanding of how the event chain works. Someone suggested in another thread a while back to increase habitable planet setting to another one and I think that fixed the problem for that player.
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