I'm sorry to hear about your first test experience - but you can beat this thing!
First, email
studentservices@manhattangmat.com and sign up for a (free) Post-GMAT Assessment - right away! This way, you can discuss with an instructor what to do to prep for the next time based on what happened the first time around.
From what I've heard on other forums, Kaplan tests really low-ball the scores, so don't use those as good score indicators.
How did your math and verbal sub-scores for your last few practice tests compare to your sub-scores on the real thing? (The sub-scores are the 2-digit math and verbal scores.) You mentioned thinking that verbal was your strength, but your verbal sub-score on the real thing was 27, which is around the 45th percentile (compared to your math score, which was around 55th percentile). Is it the case that most of the score drop was due to a drop on the verbal side?
You also mentioned running out of time on the verbal side. At what point did you feel you had to start rushing? For how many questions? Do you have any insight into why you got behind? Eg, did you hit a hard passage or argument and realize only after the fact that you spent way too much time on it? Etc.
Finally, I agree that, for verbal study, OG is best. We all (meaning the test prep community) do our best to mimic the questions, but this is inherently harder on verbal than on math, so depend most on OG to get a feel for the language they tend to use, etc.