Great post!

I think that it is easier to have a higher curation relative to SP if you have less SP. My own ratio is 0.1064%, so similar to your own, based off only 44 votes out of 70 for the last 7 days, and putting no thought into financial curation, simply upvoting the things I like.

My purely anecdotal evidence for the above is that my largest curation (a couple of weeks back now) was nearly 10 cents off my (at the time) 2 cent upvote (which I think would scale up to a huge 2.6% off 70 votes on your scale). [It was slipping in ahead of someone who upvotes their own comments on day 6. It was to see the financial impact (the idea being to set up some form of robin hood levy on the return on self upvoting - not that I actually have any problem with the "investment approach", I just think the return on it is too high currently due to whales who don't vote )]. But the large curation came from getting in ahead of a larger upvote, and I'm guessing this doesn't scale if you're a whale.

I think the way to getting "curation data" is to reconstruct it from the underlying rather than extract it. I have some thoughts on this, although it needs more investigation. I'll try to do a response post once I'm finished with the votebots!