Yea I agree. RC has always been an issue for me, and I don't know if PT 67 had a really difficult RC section compared to others or if it just played my weak areas, but I got -11! Which pummelled by score and my confidence.
Retake the test that you're not satisfied with. It's like "fool proof" the whole test. But I think it not only boosts your confidence but also makes all the stuff in the test sink up your head. Good luck!
Just gain some confidence in your ability. You obviously know what you're doing :) just say. Ok LG I'm going to f&^* you up. And persist! You can do it, you have all the knowledge!!