Playing with 300% richness and 25% frequency and 133% size, it seems the lead patches are much, much more dense than other patches with the same distance away from spawn. (Same thing with graphite)

Might be something to do with how the sliders are handled. In my game with default resource settings Lead patches are consistently 1/4 to 1/2 the density of iron/copper/stone patches at the same distance.

Curious -- any chance you are using RSO?

In vanilla, lead definitely should not be richer that iron or copper, once you get out toward and past ~1000 tiles. The starting patch of lead is meant to be the richest, since it's in much higher demand relative to other resources, early game. I've loaded a few new maps and found this to be the case.

Graphite might be currently tuned a little bit high, still. I will likely tone it down a bit. I tend to try to overestimate when I first release a mod, hopefully only a little, and then tune down. (Though it didn't quite work out like that getting Silicon from stone)

Given another recent thread mentioning lead was too low, I definitely have some sort of balancing to do. Maybe adding new presets would help :)