To repeat the procedure :
1) Generate games as usual until you find a map you like.
2) Make any changes you want to the map using the map editor BEFORE you move to step 3, because the map editor really HATES planets numbered greater than 31.
3) Generate new games loading the previous Version of the map repeatedly for a 10 good planet start for 14 + 6 random races until it bores you.
4) Then do the same except one race repeated 20 times moving down the list of races and starting over again until you choke on the number of planets.
5) If you are like me and want an even distribution then in step 4 modify the first of 20 to be an ancient race so that you can see how many planets are colonize/breathe each pass.

If you do not like big maps, nobody will force you to play one.....