I understand that it is an optimization problem, but I don't understand why you are so fixated on 50/50.
Usually, when you are trying to optimize something you slowly turn it up until you reach a point where you see the change going into the wrong direction again. Then you start testing the range of the breaking point.
Lets say you find the breaking point is 45% curation. Then you try to find the best split in the 38-44% range.
I understand that testing would take months or years, but nobody seems to even consider testing this. Stinc could run a live copy of the steem chain an see how it would affect the distribution if you change the numbers.
But just picking a random number like 50/50 and hoping that it's the best split possible for reaching your proclaimed goals is delusional in my opinion. It might be better than it is now, but is likely not the best split possible.