the solution to the too many terraforming candidates is to add a bunch of repeatable anomalies to the gameThe terraforming candidate anomaly is actually quite rare. But it can be repeated.
Most anomalies can only fire once.
So, if the galaxy is large and you get to explore much of it, you'll see many terraforming candidates in the end. However, there will be nearly none pf the, before the other anomalies run out. It is noticeable, when big areas only become accessible after jump drives, suddenly there is a cluster of candidates.
- 3