Recently I started playing again after 1.8 came out. When I setup my game there was no option to set the frequency of precursor worlds anymore. There is one for excellent planets. Does that option include the precursor worlds? 

I also have one other question. If I build a mining starbase next to say durantium, does the durantium go to the closest planet? I do not see a route go from the starbase to my planet. Even though the planet is 4 hexes away from the mining starbase. My asteroid mining operations and durantium mine near my homeworld connects in a network with a series of hashmarks on the map. So, I am curious why that does not work with my other planet. It is strange. Thanks for any help. Sorry if this is confusing, it is just hard to explain.