I have noticed the same thing with not enough sulfur in my games. I played a small game recently that only had 2 sulfurs. I had uped the game from 5 civs to 10 civs so the two with sulfur ran rough shot over the other 8, including me. Is there a way that we can change the amount of sulfur on a map via its map script. Even in the games that i get sulfur i was usually the only one, I even played a map once that had NO sulfur at all.