If you really push hard, I think you should be able to break 10 minutes. By hard, I mean all out, nearly vomitting effort. I assume by the fact that you were able to jog after the 400m repeats that they were not truly "sprint" speeds? After a true sprint of 400m 100% effort, jogging probably wouldn't be possible.
Run the actual test and let me know what you get - I am curious.
BTW, I could probably do those 6 repeats starting at 1:15 and ending around 1:30-1:35 and I did 1.5 mile all out run a couple of weeks ago in 9 minutes 35 seconds!