A few thoughts for you...
First, a bit of tough love: There are only three question types on the verbal section, so don't get caught off guard when you see a RC passage pop up -- EXPECT it! About a third of the verbal questions will be RCs, so mentally prepare for it
Second, I'd suggested doing more full-length practice tests. The issue you identified about the nature of practicing RC's from a book vs. seeing them on a live test is a real one, and the best way to get good at switching gears during the middle of the Verbal section is to practice it.
Third, the purpose of taking notes while you're reading the passage isn't to transcribe everything you're reading in the hopes of finding the answers to the questions on your scratch paper, but rather to keep your mind actively engaged in what you're reading (i.e. active reading instead of passive reading) and paying attention to the most important things in the passage such as main idea, attitude/tone of the author, organizational structure, etc. If it's burning up all your time when you take notes, you're probably writing down way too much on your scratch paper.
Finally, of all the question types on the GMAT, RC probably lends itself best to being able to identify WRONG answers (thus improving your chance of finding the right answer) even if you're not fully understanding the passage. There are some good tips about how to do that in this RC video lesson:
https://www.dominatethegmat.com/video-pu ... rehension/.
Best of luck to you and let me know how else I can help,
Brett