Nietzsche's bias against altruism

I have a problem with Nietzsche's often brilliant individualistic psychology: he seems wrongly biased against altruism, even if he says that he allows altruism for the “herd,” but not for the superior "creators of values." The social foundation of human nature and evolution is almost dismissed by Nietzsche: sociobiology had not come into existence (although Darwin had). Nietzsche preferred cynicism and egoism and he virtually hated the revealed religions as a consequence of their herd altruism which he said was designed only to help the average and the weak.  (Libertarian Ayn Rand seems to have followed Nietzsche in this bias.)

But this psychology can be turned around: if values and morals are relative to the perceived power (survival) needs of those creating the values, as Nietzsche contends, then individualism and egoism also fall in this category, and Nietzsche himself perhaps unconsciously promotes that which best helps his own personality with his particular strengths and weaknesses (and will to power)---even if Nietzsche was more self-aware than most philosophers, as Freud suggested.

Human nature and human behavior say that we need both the average and the superior if either is to rise in the world, and we need to distinguish the superior-social from the superior-antisocial. This is how the same values can apply to Ordered Evolution for all groups.