Very interesting undertaking. I think it also is determined by your number of followers. I've seen somewhere that someone had been able to access a larger dataset to analyse and showed the beakdown by hour of day. I just can't remember who posted it.
I know, I saw it too. I tried posting on the times he suggested but didn't feel like it was actually the best time for posting. So I am trying to find out for myself what gets the most views.