It's funny to me that you would say that, because the way I read it was mainly that slave morality is built on resentment whereas master morality was built on self-improvement. The impulse to flee suffering or to inflict it (even on oneself) is the the difference between the lamb and the eagle, and thus the common and the aristocratic virtues. I wouldn't have thought to separate the two ideas.

But again, one of the reasons why he ought to be read more; two people reading it come away with five different opinions on it.