Perhaps I'm not 100% right on what you value, and perhaps I shouldn't have used the word "fundamental" there. However, I wasn't assuming anything. It was an interpretation of the things you wrote in your note.
I agree that "value" and "values" are distinct, and you do a pretty good job of distinguishing between them. However, your distinction is right in line with what I've been saying. Values are what we value, value itself is what we're approximating when we make evaluations.
I'm sorry but I can't provide a single, absolute objective purpose, because any attempt at such a thing is a mere approximation. If you like, you can interpret from what I'm saying what I value, and therefore believe to be objectively valuable relative to this context, but that's not the point of my argument. My argument is not to claim one thing or another has objective value, it's merely to show how all of us implicitly believe in objective value whether we like it or not.
I agree that contextualism seems like a good thing to read up on, since my belief is in "context-dependant objective value," not absolute value. From what I've read so far, contextualism is quite compatible with what I've been arguing for.
With respect to the science bit, I think it's pretty relevant. A misperception as you put it, is none other than a failure to perceive correctly. The word itself is value-laden. There's a "correctness" to be achieved and it's possible to fall short of this. To perceive correctly is to value the right things at the right time.
It's entirely possible that in the context of economics, it may be prudent or useful to assume that all actions are rational. However, to expand that to the point of claiming that all value is subjective, or that there cannot be such a thing as a bad deal seems counterproductive to the very values on which Austrian economics stands.
Context-dependent objective value has become an axiom of my thinking because without it, literally nothing else makes a lick of sense. For another take on this same topic, check out John Vervaeke's work. His concept of "relevance realization" is somewhat in line with what I've been arguing but I think he takes a more relativistic approach than I. Still a really interesting guy though.