"Me", will, and chance

Will is something that determines human acts, thoughts etc. It is will what makes man reluctant to toss a coin for something (cf. The Antichrist about Christians: "in point of fact, they simply do what they cannot help doing"). The problem is, whether it is itself ruled? And here two terms which complicate the picture appear: the term "me" and "chance" (i.e. something independent from anything, beyond control).
The term "me" (as in the statements "it's up to me", "it is you who willed that") had already been recognized as empty in the preface of Beyond Good and Evil (or as connected with the superstition about the soul). Later Nietzsche stated more clearly that it was a tautology ("what will I do? what will my decision be?" – "it's up to you" – that actually means: your decision depends on your decision, something happens in your mind and not somewhere else...). See e.g. On the Genealogy of Morals:
The same however can be applied to the moral weakness of a Christian (his lack of resistance), who would certainly prefer not to sin and would construct himself otherwise if he could. "And many a one can command himself, but still sorely lacketh self-obedience!" – Nietzsche criticizes the idea of "free choice", and even of "choice" in general (cf. the end of above quotation): man does not want to "choose", man wants to affirm himself ("will to power").
Another problem is the role of chance. Unless the change brought to man is too big, a chance is generally responded by will, wherever there is will. He calls it "the redemption (of chance)". This topic dawns as early as in Human, All Too Human, and it returns in many places of Zarathustra. For instance in part 3 it is discussed as follows:
I am Zarathustra the godless! I cook every chance in my pot. And only when it hath been quite cooked do I welcome it as my food.
And verily, many a chance came imperiously unto me: but still more imperiously did my Will speak unto it (...)
Earlier in this part:
The time is now past when accidents [Zufälle] could befall me; and what could not fall to my lot which would not already be mine own!"

To cut it short, if it was always that "we choose a chance", then there would be determinism (for "we", "we ourselves" means: our will and its filtering and determining capabilities). And since it happens otherwise ("a chance chooses us"), then there is indeterminism. But the latter case means we have no will in a topic, i.e. it is at that time morally indifferent to us, adiaphora, not opposed to anything (and therefore even more there is no guilt).