Well, you don't need to store the revoting power for each target author explicitly. You just need to check the account history of the curator in the last kth days (depending on the revoting power recharging) to determine his revoting power on a particular author. This should be feasible I guess.
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Hi @smcaterpillar. I just published my proposal about this issue. I would like to see your opinion.
Steem proposal to reduce voting rings and self-voting