i also took examkrackers for the april mcat, but didn't end up taking the mcat.
their 101 verbal passages book just came out and i just did a couple of passages- they seem a bit more difficult than aamc passages, but the questions are very mcat-like, the most mcat-like i've seen before. (if you want to order one, just go to
www.examkrackers.com or call 888-krackem)
i honestly think to do well on verbal, you just need to do passages everyday so you become familiar with the types of questions and answers they like.
also, i don't think you should mark up the passage and concentrate on details- the important thing that EK stresses is after reading the passage through CAREFULLY the first time, you should understand what the author's opinion is and what the main point of the passage was.
don't worry- it'll come with practice. i'm having trouble with verbal myself also, but we have a month left, which is plenty of time if you practice EVERDAY.
good luck!