If you have set the additional curator rewards into 4% (by default) then you're actually doing a 48%/52% split of rewards from the original 50/50. 52% goes to the curators, 48% of your regular $9-$13 a post will be yours.
The above statement will become true if you set @reward.app as a beneficiary at 100% to your posts.
I tried setting it in Peakd and it wouldn't let me. I'll try in the next post