C1. Not all discourse that relates to the question of what we ought to do is moral discourse. There is also discourse about the more casual sorts of ought claims that fall under the category of what is commonly called “self-help” philosophy. This might relate to questions regarding what kinds of relationships you should form in your life or what kind of diet you should have or how should you manage your finances. — TheHedoMinimalist
There are different senses of the word 'ought', but in moral discourse the 'ought' is the normative ought. That's the same as in self-help books. The difference is that self-help books are appealing to 'instrumental' normative reasons, whereas in moral discourse we are appealing to 'moral' normative reasons. But both kinds generate normative oughts.
What is taken to be distinctive of moral oughts - and it's in dispute whether this really is what makes them distinctive - is that they override others. In other words, moral reasons have more oomph than instrumental reasons, and thus if Xing is maximally in my interests, but Xing is wrong, then I have overall normative reason 'not' to X.
C2. The existence of moral duties implies the existence of a “special” sort of reason that overrides self-help type of considerations. — TheHedoMinimalist
I take it that what you say here simply expresses what I have said above, namely that moral normative reasons trump other kinds of normative reason. It is more important - that is, we have more reason - to do the right thing, than anything else.
So far that sounds correct. It seems like a conceptual truth that whatever it is morally right to do in a situation is that which we have most reason to do. ("I can see that Xing in these circumstances is what it is morally right to do; but what do I have most reason to do?" sounds confused).
C3. The existence of “special” moral reasons implies the superiority of moral philosophy over self-help philosophy. This superiority makes the notion of a decision failing to be bound by duty for being too demanding on your personal life seem implausible and repugnant. — TheHedoMinimalist
I don't understand how you get to the second claim from the first. The fact that moral reasons are not instrumental reasons means that it is always going to be possible that the moral life and the life it is maximally in your best interests to lead will not be the same. Sometimes we may be morally required to do something that it is not in our interests to do.
But you're making the much stronger claim that this entails that morality will be too demanding. I don't see how that follows. For instance, that instrumental reasons and moral reasons are not the same does not prevent instrumental reasons affecting what we have moral reason to do. If Xing would not frustrate too many of my ends, then I may have an obligation to do X. But if Xing would frustrate many of my ends, then it may be that I do not have an obligation to do X. For instance, it seems to me that I am entitled to do pretty much anything if my life is at stake and I am not responsible for it being so. If an innocent person is about to explode and kill me and the only way I can prevent them from exploding is to shoot them dead, then I am entitled to do so. And if there are ten such people I am entitled to shoot the lot of them. Normally, of course, one is not entitled to shoot innocent people for the sake of one's own interests. But under these circumstances one is. So these sorts of cases are ones in which instrumental reasons are radically affecting what one is morally entitled to do.
Anyway, those are matters of some dispute, no doubt. But the point is that you've fallaciously inferred that as moral reasons are 'special', they cannot be informed by and responsive to our instrumental reasons.
It seems to me, then, that all you're entitled to conclude is that what we have moral reason to do is to some extent responsive to what we have instrumental reason to do. I don't see how you get to the conclusion that we have no moral duties or that all moral duties are such as to be over-demanding due to their being distinctive and overriding.