The focus of your questions betrays too great an emphasis on trying to get stuff right. Re-read that business mindset article again. And again. Read it every day from now on, if needed.
Your goal is NOT to get everything right! Your goal is to identify when something is too hard and let it go. You've got to change that mindset if you're going to stabilize your score at the top levels. Even at 40+ on verbal (90th percentile +), you are NOT getting every (or almost every) question right.
If you get many / most of the first 10 right, then you will have kicked your score very high. That's exactly how the test works. So you should
expect to see some very difficult questions coming up next. The question is then: which ones are
too difficult to be worth your time / mental energy / business investment? The test writers actually want to know that you can evaluate this and have the discipline and presence of mind to cut yourself off when appropriate. They are NOT trying to see whether you are a super-verbal-guru who can get even crazy hard stuff right.
If the entire passage is truly 100% incomprehensible, then maybe you do want / need to get them all wrong.
But maybe it's not 100% horrible. Maybe you can get the main idea question and you guess on the rest.
Or maybe you can do one of the detail questions, but it takes some time, and you gain that time by bailing immediately on one of the other detail questions.
Which part of the passage was the worst? If paragraph 2 was the worst, but paragraphs 1 and 3 aren't so bad, guess immediately when you get a question about paragraph 2 and try to answer questions from paragraphs 1 or 3.
See what I mean? You're making a series of business decisions based on the circumstances facing you in that moment. It's not necessarily all or nothing. And you have to stop prioritizing winning over time. They are testing you on how well you manage your scarce resources - and trusting to luck is not the optimal management style.
You have limited time. Just like you have limited money, right? You can't invest in every possible investment that comes along; you have to make hard choices - and sometimes you let one opportunity go because another one is better. (Even when you haven't yet seen that better opportunity! You just trust that there will be other opportunities in future.)
On the language question, your English is excellent - I would not have guessed that you are not a native speaker! I really don't think that's the problem. I think the problem is that you are trying to get stuff right that you should not be trying to get right - even a native speaker shouldn't be. Don't attribute it to some lack in language skills on your part. Rather, it's a lack in strategy / business mindset. Stop trying to do more than you should.