I heard the kaplan verbal methods were bad because it focuses on details. I don't know if this is true and not sure what the mapping method is but I find it interesting you're scoring so low on verbal. Maybe the theory about kaplan verbal is true? Who knows.
I'm bad at verbal too but these are some things my course taught me:
1. Focus on the main idea not details (this will help you differentiate answers choices that agree with the main idea.) Mcat rarely tests details.
2. Focus on tone to help differentiate answer choices. Ask yourself does the answer choice agree with the tone of the passage?
3. Write down contrasting theories, Main idea, and paragraph summaries and look back at this instead of the passage.
4. During the "tutorial time" make a timing charge (8 min per passage) so you don't run out of time ( After 8 minutes move on)
5. Learn the question types for example main idea directly asked.
6. Practice doing these things under non timed conditions on practice passages and be very detailed and making sure you understand the passage. Each time trying to do it faster.
7. Practice reading a passage and in 3.5 minutes writing a main idea contrasting theories and paragraph summaries will getting a grasp of the tone. Do this on the mcat.
8. Read scholarly works. Some people say this help for example the economist.
9. Pay attention and write down the qualifier for example: NOT
10. Does the answer choice agree with the author's opinion?
Verbal is tough tough and sometimes 2 answers choices may be right and one more correct. Just do your best and that is all you can do! Hope this helped if not oh well.
Best of Luck