I looked into this a while back and even though my curation APR is good according to hivestats, I am in the same problem with keeping my voting power above 80%, and one of the reasons is as one's circle expands more is expected from voting power. I wonder if we will ever get a better way to manage our curations.
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I think the best way to manage it, is to own more hive power. Like you said, when one's circle expands, it means you'll have to spend more hive power which automatically affects your plans to keep it above 80%
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