There is no thing both empirical and sujective. Empirical is that which is open to be percieved by any similiar cognitive process, subjective is that which pertains to only one, specific such process as it pertains to it.
Lies, lies, them filthy lies!
Seriously now, have you ever heard of Daniel Kahneman and Amos Tversky? The former got the Nobel Prize in Economics in 2003, and the latter was his mentor (now dead). Kahneman started off as a physician, before expanding to philosophy and eventually getting also interested in economics. All his nobel-winning work hinges exactly on this idea of empirical subjectivity that we are discussing here, eventhough he called it differently.
His most famous scientific papers as a physician concerned the reaction of the optical nerve to variations in context: he actually proved that if you look at the same white square surrounded by, say, first a light yellow frame and then a black frame, the white square looks different eventhough it is the same, in the sense that it produces different measurable physical impressions on optic nerve and retina. This idea then made headway in the behavioral sciences; Kahneman's main idea in economics, ie people make economic decisions based on loss aversion rather than total utility, is also derived from the idea that the context is entirely relevant in determining the empirics of behavior.
Sorry for the long digression, but this is stuff I have worked with to great enjoyment - the idea that empirical subjectivity is nonexistent is just wrong and reflect an old idea of "real = constant" that applies at the macro level (the white square will always be perceived based on light frequencies that hover around white, never as purple, no matter what you frame it with), but is not exhaustively explanatory at the micro level.