It's about 2/1 for the system I have, but some units are very high waste, I believe the best are about 1/1.
Not much to offer Cory except keep trying to track down the problem. Just for comparison sake, here are two pics, first of my whole house (I think 25 micron) filter which was cleaned Oct 1. The iron is from the street pipes and gets higher when sprinklers are on in the summer. Right now, it's not too bad. In Juy/Aug, the filter has to be cleaned every two weeks, it traps a lot of particles. In the winter/spring, 3-4 months is typical.
The second one is the RO unit, the sediment prefilter on the left was cleaned sometime in Sept, it's a .5 micron filter, needs to be flushed. This is a Spectrapure marine unit, I happened on for a great price, I replaced the DI cartridge with another .5 micron carbon block, since DI isn't essential for freshwater.
Maybe what I have with not so great water (dGH/dKH 21, pH 8.3, phosphate buffers, dissolved iron, too) can at least give an idea where you are from a gunk standpoint.