That's interesting because all my posts are getting more like a 50 50 split.
5.949 SBD, and 1.835 STEEM POWER for eroche/seven-day-b-and-w-challenge-day4
The payout on that post was 13 dollars, some of which would be given to curators. I know the price of steem is causing noise here.
You can check the current average reward split of all witnesses on Steem Supply.