I think you shouldnt use all of your remaining voting power, if you use it more often instead of all in a few hours, you could help out a lot more people/minnows (with greater rewards)!?
Btw; I found this article very usefull in explaining the curation rewards:
https://steemit.com/steemit/@calamus056/curation-rewards-explained-in-great-detail
RE: Live $1800 Steemit Upvoting from 100% to 0% Voting Power on June 24!