I see this and I can see where it supports where you are coming from wbernys. What I am not convinced of is that talking in terms of "psychology" is helpful to a philosophical discussion, as I see much potential damage in it for the reasons we are discussing. Is focusing on "psychological hedonism" not just a method of "apologizing for" hedonism?
I would say that Epicurus is not advocating the pursuit of pleasure because we "have to" pursue pleasure, he is advocating for it because Nature prescribes it, we have the ability to ignore Nature's prescription, and we will live better if we follow Nature rather than substituting our own goals. Do you see that part differently?
Quotepsychological hedonism, in philosophical psychology, the view that all human action is ultimately motivated by desires for pleasure and the avoidance of pain. It has been espoused by a variety of distinguished thinkers, including Epicurus, Jeremy Bentham, and John Stuart Mill, and important discussions of it can also be found in works by Plato, Aristotle, Joseph Butler, G.E. Moore, and Henry Sidgwick.
Because its defenders generally assume that agents are motivated only by the prospect of their own pleasures and pains, psychological hedonism is a form of psychological egoism. Psychological egoism is a broader notion, however, since one can hold that human actions are exclusively self-interested without insisting that self-interest always reduces to matters of pleasure and pain. As an empirical thesis about human motivation, psychological hedonism is logically distinct from claims about the value of desires. It is thus distinct from axiological or normative hedonism, the view that only pleasure has intrinsic value, and from ethical hedonism, the view that pleasure-producing actions are morally right.