Two years... oof. That's a long time to be fighting a brake rub. The worst part is you probably got really good at doing it the wrong way. Happens to everyone with something. Did you figure out the right way, or are you still figuring it out?
Oh man, that hits home. I spent months trying to fix a squeaky floorboard by tightening every screw I could find. Turns out it was a totally different board that had come loose. You get so focused on one fix you miss the real problem. It's so frustrating when the answer was right there the whole time.