Great job pulling this together, especially the manual data collection (which must have been painful!)
I also use steemsql and have been struggling to find data on curation rewards. There is a table there called VOCurationRewards but the most recent data is from August 2016. If you find out where this data can be pulled please let me know. Happy to collaborate on any findings.
A little painful yes, and an impossible method for a larger set. If I find I will share in a post for sure. Cheers!