As someone who averages about -4 or so on RC, the strategy that has REALLY helped me is sometimes going into a PT I've taken before (long time ago) or an old PT and really breaking down and examining the answer choices based on what the passage would need to say to make the answer choice right. I do this without even looking at the passage. It has trained me to recognize the level of support different answers need. So, when I'm drilling/practicing on RC passages, I can better sense queues for AC's that are too narrow or not grounded in what the passage/low res paragraph was talking about. Hope this little extra drill helps :)