If you want honest advice, I would say that you need to study harder. You need to put in the time, and recognize that if what you're studying is becoming repetitive/ is boring you, then you are doing something right. For audit, I read over every chapter 3 times, and only did multiple choice. Def take notes on your weak points, but do not over indulge in note taking, as it a big time waster. I would just read the lectures, and not watch them.
This test is not easy, and is highly subjective as you said. I know this is simple advice, but its whats gonna get you that CPA. Try your best to not feel discouraged. You will pass this exam. In college, I once failed a tax exam with a 40. I didn't pay attention in class, and was blindsided lol. Recently I passed REG (with an 84) after 3 weeks of studying, and the material was mostly new to me. My point is, I had a killer comeback with Tax material, and you will have the same with AUD.