Sulfur caves should be more uncommon, higher occurrence of sulfur springs

Overall I really quite like the new Sulfur Caves! It might just be the seed I made, but I do think they are a tad bit too common. To ensure that players can still find the caves, I think expanding the sulfur springs on the surface would be nice. We don't necessarily need a new surface biome (would be cool), but maybe having a proper, semi-large hot spring + some sulfur formations would be nice. When I was flying around my world, I would only occasionally come across the sulfur springs, compared to the volume of actual sulfur caves.