I understand that about the neck and middle positions naturally having more bass because of where they are, so I'm looking for pickups that are designed with more mid/high and less bass output as part of their natural EQ curve, through magnet choice, coil windings, etc...
I've heard bridge pickups that sound bassier than others, again from magnet choice and windings, wire size, etc... the bridge pickup in my strat has a very "quacky" sound which I've always associated with mid range. Kind of the "cocked wah" sound.
If this "isn't entirely possible", I have to wonder what the point of even making more than one type of pickup even is, and why anyone bothers discussing the differences in mid and treble content in pickups.