That's great efficiency! :)
Sometimes when a small vote follows a big vote, the efficiency is reduced, but with your numbers, I'm not sure the difference would be too noticeable as you're way above what I've seen up until now! I could try to follow your votes for a while and see how my average moves. I'll add it to my calendar.
I think my efficiency is like this because this past week I manage to find great posts that were almost in zero and later they got very big votes, one got to 54 in total, and the other almost 40 HTU. I'm not sure if I'll be able to replicate this again, but feel free to follow my votes.
It'll wait a bit. I will check up on you in a few weeks. I'm currently testing another trail! :)