Miscegenation and Master Race

In #13 of Beyond Good and Evil, Nietzsche warns against "superfluous teleological principles".  However, in #960 of the Will to Power collection, he does not heed his own warning.  For, there, he advocates Miscegenation as a means to the production of a "master race", which entails both 1. superior beings, and 2. beings, who, by virtue of their superiority, would be "masters of the earth", i. e. would "work as artists" upon inferior beings.  So, #2 is a superfluous teleological principle, not only in the specific context, but with respect to the dynamic of Self-Overcoming that constitutes the Will to Power, in general.  Furthermore, beyond mere logical superfluity, the seeking, by a being, of a being that would not only be superior to it, but its 'master', as well, seems difficult to not classify as the yearning of a 'slave', a classification that is equally difficult to reconcile with most of the rest Nietzsche's doctrine.  Instead, more consistent with the concept of Self-Overcoming is the thesis that the fundamental concern of those superior products of Miscegenation would be to, in turn, continue the ascent, via procedures that are likely unforeseeable two stages in advance.