I was thinking about this and the only way I can come up with to spread the Steem Power of circle-jerking whales and dolphins is to diminish (or block completely) voting on the same account within a given time-frame.

ie.

• Whale A votes for Whale B at 100% on Friday
• Whale A can only vote for Whale B at 75% on the next post made by Whale B, then 50%, 25%, etc. on subsequent posts, until maybe 5 or 6 posts, when they get 100% voting privileges again.

Algorythmically speaking, it should be possible to implement, and in theory should spread the SP more evenly. It does have a negative of not giving full freedom of reward however...