I also used the Kaplan strat and it worked for me...but I tweaked it a little. When you get to the lesson and practice in class... what they tell you to write down IMO was a little TOO vague. I wrote down a few more details than they did, but made sure to never spend more than 9-9.5 min on the passage. Then used that map to answer the questions and on both test day and practices, there were a few questions that I never had to search the passage for, i had the answer directly on my sheet.
Be warned though. I think almost everyone who took the kaplan class can back me up on this. The practice tests for RC in Kaplan as way too many specific detail questions. While they do represent about 1/2 the questions on the real DAT, they're sometimes 75-85% of the Kaplan Practice. Make sure you understand how to get the main idea, tone and more conceptual/less factual questions too. Kaplan underestimates their presence on test day.
Go dominate osims. Waiting to hear about your 28 😀