I don't think it's a big deal that you took a 10-min break instead of 8. I'm much more concerned about giving yourself an extra 5 minutes on that test. You gave yourself a HUGE luxury that isn't allowed on the real test.
Part of the pain for
everyone on this test is the fact that we can't answer everything in the allotted time. It doesn't matter how good you get - they'll just give you harder stuff, right? So part of your task is to figure out when the test has found your limit (and it will, unless you score an 800!), and LET THOSE GO. And you didn't do that on the real test - you talk about taking too much time on some questions right from the beginning. There is NEVER a single question worth spending more than 3m on (and that's if it's an expected 2m question - there's never an SC worth spending more than 2m on, for example).
Think of this as a tennis match, not a test. You're going to win some points and the other guy is going to win some points; you're not going to win them all, right? Your goal is to put yourself into position to win the LAST point. Translated, that means you have to put yourself in position to answer the last question - you have to have time to address it. Otherwise, you've lost the last point, and by extension the match. When the other guy hits a winner, don't go running after it so fast that you hit the fence and injure yourself, thereby hurting your chances on the later points. (Translation: don't go way over when the problem is too hard.)
(Note: you don't literally have to "win" the last point on the GMAT - the last question isn't any more important than the others in that sense - but you have to give yourself a "clean shot" at any question, and you can only do that by acnowledging when the computer has already won the shot. :)
Is DS really your weak point? Or are you slower on PS, so you have to be faster on DS to make up for it, and then your DS performance suffers? I see that a LOT with my students. Check the data from your recent tests and see.
Time of day can be a factor, yes - it depends on the person. For me, an 8:45a test would definitely slow me down; I'm not a morning person. :) In particular, you mention feeling like you got a slow start in both sections, and you never took your tests at that time of day... so, yes, either take the test later in the day next time or take your practice tests in the morning.
Because you did so well on the essays, one thing you can try for next time is just writing a bit less and taking a bit less time so that you save more energy for the main event. Honestly, if you can write well enough to get a 6.0, then you can write a decent amount less and still likely get a 5.5 or 6.0. (I never write more than 4 paragraphs - two examples!)
I still recommend that you do the analysis in the second article I linked to last time - share your analysis with your tutor (and here if you would like). You may also want to send your tutor the link to my article - this is how I review the tests, but every teacher has somewhat different methods.
Here are some other articles that might help:
http://www.beatthegmat.com/mba/2009/12/ ... managementhttp://www.manhattangmat.com/articles/a ... roblem.cfmp.s. Where in Canada are you? I'm in Montreal. :)