RE: Improving Curation efficiency on June

Yes, you can get how much you earn on upvoting content by using either Hivetasks (https://hivetasks.com/@svanbo) or Hivestats (https://hivestats.io/@svanbo) .
for instance, if you have 1000 Hive Powered and you get 7HP as a curator in 30 days, that means you get 84HP a year and so 84/1000 is 8.4% efficiency (or 8.4% APR).
In your case, using Hivestats, seem you are obtaining 1.25% a year, that's not so much and I'm sure you can improve it easily by upvoting content you like