New form of the ontological argument
You mention Pure Act, which is of course from Aquinas. God as understood by Aquinas have 3 parts: his essence, his free will, and his necessary will. Now moral goodness doesn't flow from essence. You can't define goodness by substance. This is not how moral goodness is properly understood. It is impossible for any being to simply possess moral virtue. Morality is act. God's goodness might be seen as infinite possessed goodness, but that couldn't be as good as proper virtue. So let's set essence aside for a moment. So we have necessary will now. Nothing willed necessary is morally perfect. That's obvious.
Also, how would do you reconcile God having one will when he wills necessarily and freely? I thought he was supposed to be perfectly simple.
It is said when talking about the "problem of pain" that God cannot create free creatures who can gain virtue without allowing them pain. However, since God was always happy, couldn't he create creatures more in his likeness (without having to allow pain)? God doesn't face struggle to find happiness. His act of existing is blissful I thought. So we have an infinite deity who loves infinitely but does so with bliss and necessity. And we have his creatures who have animal natures which earns its way in life through strain of their muscles and wits. Doesn't this seem strange to you?
So the conclusion is your idea of God is vague and probably inconsistent, and therefore trying to prove his existence from sheer logic is ridiculous