I use hive.vote for my auto-voting and I haven't really bothered with rewarding app. Though I only have it toggled on when I am above 96% VP and I should probably add more accounts to that list because I have come back late at night to see my VP stuck at 100% a few times already.
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That's a very good use for hive.vote. The votes are only triggered when voting power is not used. Just you need to make sure that you have enough accounts in the fanbase :-)