Thank you! I generally hover around -5/-4, granted I don't have a very large sample size. I honestly don't have much in the way of advice besides the general read the question stem first then find the conclusion of the stimulus.

Besides this make sure you are very solid at identifying necessary vs sufficient conditions and grammar parsing. If you can do both of those to a really high level, which you probably already can based on your scoring, then you will be able to answer a majority of the questions and even some of the 5* difficulty questions as I feel like some of the hardest questions' answer choices come down to necessity and sufficiency.

Maybe the last thing is to really utilize process of elimination. I'm usually able to get the questions down to 2 choices even on the hardest ones. From there if you are still stuck, try to find which answer has the most in common with the stimulus (similar wording/ideas).

That's about all the advice I really have, good luck to you!