I know people don't like to admit it but fatigue/tiredness plays a big role in riding like this .. I kept saying towards the end of the day that I was tired and wanted to call it quits (ask em), I had a 70 mile ride home on my bike as well ... but Blake said he wanted to out another time and I told him I'd follow behind and try and see his body positioning and let him know of anything I can think of ... he pulled away from me though cause I was too tired to give it 100% lol.
I'm sore as fuck today, the ride to work was a PITA. that track there, wow what a friggin work out. I need to do some endurance workouts like you Mike