Hi Jeffrey,
I cannot speak to the other tests you used, since I did not use them myself. I used the written tests from Rita's book and the online PM Prepcast tests.
Here is my perspective, for what it's worth (you'll have to decide how anyone's advice applies to your particular situation): I would not sit for the exam having scored only 62% on the PM Prepcast tests.My experience is that these tests represent very well what the actual exam is like. And, even given that, the real exam was a challenge. I passed on my first try but I was scoring in the mid-80s on the tests. Your test scores from other sources seem good, but you may benefit from focusing on testing in the style presented by the PM Prepcast (I highly recommend doing multiple 4-hour tests to give yourself more opportunity to get a more realistic experience).
Were I in your position, I would delay the test for a couple of weeks and focus on taking the PM Prepcast tests and following-up each test with a deep dive into the questions you answered wrong as well as those you "guessed" on. This will raise your confidence and better position you for success.
Best of luck!
Tracy