If you're not going to trust empirical evidence, what on Earth are you going to trust?
Critical rationalism.
How is dismissing empirical evidence the definition of rationalism?
"Rationalists have such a high confidence in reason that proof and physical evidence are unnecessary to ascertain truth – in other words, "there are significant ways in which our concepts and knowledge are gained independently of sense experience".[4] Because of this belief, empiricism is one of rationalism's greatest rivals."
http://en.wikipedia.org/wiki/Rationalism
If you believe that you get truth from the senses, you are missing the part where the mind processes that sense experience in a conceptual framework.
The biases in the conceptual framework need to be analyzed through rational processes, as they are already apparent in the observations we make, and thus observation alone will not reveal them.
Critical rationalism.
Do you mean critical rationalism in the sense of Popper? I find this strange given your other comments since Popper's notion of critical rationalism does allow one to use empirical data to falsify hypotheses.
(This is aside from the fact that critical rationalism is an utterly unsatisfactory approach to epistemology.)
I did a search about property dualism and I couldn't see much written here on this site.