You said: “To use the libertarian NAP, the principle implies that aggression (the initiation of using force upon another, without consent) causes the most harm, ergo to reduce harm to everyone, aggression must not be permissible.”

I reject that assertion. Sometimes suffering caused by natural causes (e.g. starvation) can be reduced by “aggression” (e.g. stealing food); in which case a rigid application of NAP would lead to an overall increase in suffering.

You said: “By conflating morality, your own internal subjective code of conduct, with ethics (an external & objective code of conduct), you are able to claim all immoral acts (to you) are inherently unethical. This makes your subjective interpretation the only one that can be applied, at least for you.”

The distinction between ethics and morality that you make is semantics. But, I believe my writings on ethics, which I linked before, explain sufficiently why such a distinction is unnecessary. Morality, our personal principles for distinguishing right from wrong, is inherent in human nature, and since they are inherent in human nature they are shared by all humans. Ethics, the theory of right conduct, is rooted in natural law, and consequently the line between morality and ethics is blurred. I am willing to make the distinction, but it is a distinction without a difference within the framework of my theory of ethics. Also, you seem to be blurring the line between ethics and politics.

You said: “To make a single, subjectively derived ethical standard apply willingly across all individuals, in all societies, would be a computational explosion problem…. Do you honestly think a single solution, which is not innately and infinitely flexible (like anarchy), will objectively work when you are multiplying the combination factor by by 70 million?”

I don't suppose to make a single standard apply. Each community would be allowed to set rules as they see fit. Furthermore, you ought to stop to consider the possibility that anarchism will not maximize human wellbeing. Suppose that anarchism leads to chaos, doesn't establish security and stability like it is supposed to, and suppose that there is some flaw in anarchism (which you are unaware of), which guarantees that anarchism always leads to instability and lack of security in persons and property for the majority of the populace. If that is the case, then a flawed singular solution, though imperfect, would actually be relatively better than anarchism in practice.