Nice :) I have brought the hammer out on 13 so far, but it's a hopeless task without more involved.
Part of the issue is time to find and locate potential abuse but I see Patrick has linked a spreadsheet in this post
Spreadsheet: https://docs.google.com/spreadsheets/d/1lSxM3VK_VvhdfDRLUbP_PTueOE7LxHhy6F4edQN_nsk/edit#gid=1904657324
will have a look. you said post payout after 4 days. just realized the top 3 where 5 days?
Post pays out after 7 but can no longer earn upvotes after 4, giving 3 full days to manage the potential reward with a downvote.
99% sure :)