"That's a significant 30% drop to the author."
Is this some Common Core math?
Previously author rewards were 75% of payout on posts and comments. Adjusting the rewards to 50/50 halved author rewards. That's a reduction of 50% already, before adding in the impact of the 10% tax for SPS, and the reduction that will be caused by the semi-exponential curve.
Things just don't add up sometimes.