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I'm showing 22 votes in 24 hours at 97.47 percent voting power. I think if you keep it at around 97 percent you can maximize your curation rewards. If it is always at 100 percent your missing some opportunity to use your votes. I haven't tried doing over 40 in 24 hours but I have heard it will drop a lot at that point.

You can always check your vote power and number of upvotes you made here
https://steemstats.com/#/