Hey Rafael,
First of all, my commiserations with you on that news. It can't be easy to write about. Your openness is all to your credit. Also, your evident clarity on why it happened puts you in a very good position to resolve the issue that is keeping you from achieving the desired result. From your previous posts here, I'd already got the impression that you've covered the material in depth and aren't lacking in knowledge as a Project Manager, so you're well on your way.
Since the problem you've identified is not having enough time during the exam to address each question as you'd like, how has this aspect been for you been during the practice exams in PM Prepcast? Did you find it easier to complete the practice exams in the time provided? In the quizzes, have you found that your scores are much better if you have more time?
In some respects, it's sad that anyone's ability as an effective Project Manager is assessed and decided by their performance in answering multiple-choice questions in a very limited time. That's the nature of standardized testing in the modern world, to which we have all become accustomed and to which we have to conform. We all know people who excel in such exam settings but who perform terribly in real-life settings in the same domain, so don't let the setbacks that you've had in the PMP exam so far dent your confidence in yourself as a good PM!
To increase your overall speed in the exam, have you tried training yourself in that aspect, i.e. allotting yourself even less time per question than the exam would on average, in order to perform optimally when under increased time pressure?
If I recall correctly, there's an average of 1 minute and 16.66 seconds per question during the exam (230 minutes/180 questions), assuming zero review time at the end. In that case, how about testing yourself on batches of questions while allowing yourself, for example, a maximum of 1 minute?
There's also perhaps the question of time management decisions during the exam. When observing the countdown timer during the PMP exam, have you had goal times by which to complete each section? If you have gone past those target times, how have you managed your answering approach at those moments in order not to go too far over time. Have you used the 'Review' button for questions that you couldn't answer quickly, in order to come back to them later? It's always better to give yourself an opportunity to read all of the questions; some of the final ones may be those that only require seconds for you to identify the correct answer, thus increasing your success rate.
Thinking back to my own experience, I recall feeling more rushed during the real exam, taking far more time to answer each question than I had been used to when doing the practice exams. Maybe the thing that saved me from over-shooting the allotted time was being increasingly strict with myself as time went on, forcing myself to either choose an answer in a very short time or to hit review, move on and come back to the missing ones later.
Whatever strategies you use to work on your exam-taking technique, don't lose heart. You're far from alone and you're building useful skills for future assessment situations.
.. This time, it felt more organic; I've studied a lot and can explain the material easily. I have a problem with the time provided by the exam. Last time I couldn't get to 18. This time I was kind of rushing through the questions while completing the third section, and ended up not being able to answer too. I am going to change my study plan, and only schedule the exam when I start getting 80% on all quizzes.