I would probably re-take it since you were getting much higher on your practice exams and most likely would improve. I bet you know the material, just had a hard time focusing during the test and realized you were short on time and started panicking. Maybe work on your timing strategy and calming your nerves and give it another shot.
Yes you are absolutely right ... the timing was not issue as much as i lost neves in Quant and then it haunted me all the way till Verbal.
My verbal minimum was 34 in practice but i bombed in real... though i though i was doing real well.
A 680 would have made me happy.