Gogirl,
I was in your shoes last year. I was getting ~34 on the practice exams and received a 28 (9/10/9) on the real thing. Aside from verbal, which fluctuates for just about everyone, the fluctuating science scores are a sign that you have gaping holes in your MCAT knowledge. Although I would personally warn you from taking the test this time around, there's always a chance you may get the favorable test questions. This time around I gave myself a month and a half to study and my scores have been fluctuating arond 3 points at higher 36-40 range as opposed to 29-35 last time around.
And I also understand you may be trying to avoid the procrastinating, take it later mentality. I've been there, just was not fortunate on test day. Either way, you've nothing significant to lose -- the worst case scenario, you take it again.