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Ah so that means if i set 80% of power, that not means that i give to Steem-bounty 80% of my total voting power but that it should be at least 81%?

we will only vote on your behalf if your voting power is above 80%. We would then make only 1 vote. If you had 100% would be able to vote several times (like 12) until 80% is reached.

Ok so i setup 50% so you can upvote much more :))