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I'm using the weights parameter of the vote for calculation, maybe they do not work?
I will check and add a calculation based on rshares and the curve).

I took a comment rewards value, and fed it into get_vote_pct_for_SBD() and got a % that's far off, looks like the curve isn't considered.

Thanks for reporting, get_vote_pct_for_SBD and rshares_to_vote_pct needs to be fixed.