So yeah, the other night I was cleaning up the inside of the car and decided to go ahead and fold the back seats down to make room to transport my new tires to the shop when they come in. As I was folding them back, pulling the headrest off, etc. I noticed a little lever on the right side of the driver seat - right next to the armrest/console. I messed with it and didn't notice anything happening (I was in the back seat). After getting the seats all folded, I went to the passenger side and then re-engaged the lever. Holy cow the lumbar support moves!
How did I just now find out about this mystery lever half a year after buying my car lol. I felt pretty dumb afterwards, but now my seat is more comfortable!