I stole my 3rd C2, but i explored for 2 extra good c1`s beforehand so it would be easier to make good clusters. I`d only explore at 80-90planets if a big cluster was at stake.
i just can`t be asked to explore at that number of planets, its much more fun kicking peoples butts and nabbing stuff off them, even if it is junk.
Unless its an X.U class which i happened to see 2 of so far.