I've always wondered what doing what you did and inside the wheel wells with a matte or semigloss finish would do. Mines only leveled, not lifted like yours so you dont see as much up front, but you can see the rear axle in a car behind it.
It always sucks to have the truck all cleaned and waxed up looking good, but you see inside the wheel wells to the frame, axles, and suspension components with surface rust on them and the plastic inner fenders all splotchy with different colors. My truck is black so the underside really sticks out against the black glossy paint. It'd be nice to use a real rust stopper and preventer on it too.