I try to finish the first 12 questions within ten minutes, because those are usually much easier, by predicting the answer choice and have a somewhat higher tolerance for mistakes (checking it out too much will lead to shortage of time).
I believe it is about finding how the mistakes are made in timed practice but not in blind review and then bridging the gap. Meaning that you have to find how to do the patterns in timed practice right. Probably you have to reassess your habits.
A lot of folks who had the same experience made it into the 160's and even 170's, you have to get used to this kind of failure and learn from it and be persistent in order to make it.