Your first chart - the vertical axis is number of votes? I'd really like to see average post reward (or something equivalent) as a function of time posted. I've been noticing that there are dramatically more posts published during the North American day than at other times. I mean like maybe 20x more. This could mean that during the North American day, there is a significant drain on the reward pool, and that posts pay out more on average at night. I don't know enough about the reward pool to know if this is reasonable, but it would be easy enough to plot it.
Reply here if you plot it!
Yes, vertical axis is number of votes.
I will create a chart with post timing. Stay tuned.