A Different Approach to the Matter :
Personally, I am not agree that a 50/50 curation model .
But I am agree , should give more powers to the whales .
So I suggest it should change to the following way...
Curation model still is 75/25.
But the curator's 25% allocation can take a curve allocation.
In other words, the curator still scores 25% in total,
but proportion is not horizontal line, (black line as shown)
proportion can change to curve line, (pictured red line)
its mean is , if voter use more vote power, he can get more reward (his rewardwill add).
This can also inspire the whales to use higher voting rights.

I think the fork can in 1/3 of the place,
That is,
If the voter's power is less than 1/3, the reward will be reduced.
If the voter's power is higher than 1/3, the reward will increase.

Original curation distribution ratio: horizontal line
Proposed curaration ratio: curve line