Wow, a 15+ minute drop in time. You did well. Really well. Maybe the adrenalin rush from the crash was a contributor
I hope our discussions elsewhere helped.
I was also thinking during the week... do you do a warm up before starting these rides, or do you do what most of us do, start the clock at the first pedal stroke? A warm-up might be an effective way of putting the average speed up near you want right from the start.
But, of course, that thought is now redundant...
Now the next question -- what could you do right now on a road bike with drops and the bars four inches below the seat and 23C tyres????