Jonesy... you need to get your head straightened out and believe in yourself. Next time, step up to the start line to kick A$$. Holy crap! With those 1k workout times you should be at least a 4:30-4:33 miler or better right now!! Man, I wish I could do a series of 1k's like that... especially to do a sixth one and finish with a 3:03!! Awesome!
Here's what Daniel's says on page 214 of 2nd edition:
"You must learn to run fast and still be in control of your mechanics; run fast and not strain; run fast and still feel you have another gear when you need it. This is when having a high aerobic capacity pays off. It means saving anaerobic reserves as your final gear, rather than having to call on them to maintain the intensity of the midrace pace."
As I've stated regarding the series of 100+ weeks... you have the reserves as evidence by you doing this awesome 6x1000m workout.
You're on your way.