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Well, the trailing voters already got the boost with the new split, while it is the authors of the posts we vote that lost out on a portion of their author rewards. This is why our plan is to supplement how much they get out of a Curie vote on their posts using the new increased curator rewards we receive.

Right, but something else to consider - Curie's trail according to SteemAuto includes 2576 trailers. That is not counting all of those that trail the vote a different way. But if we are giving out 8 Steem to 2567 trailers it would be a minuscule amount of 0.00310 Steem per person. Even at the average rate of 80 posts voted by Curie in a week that is a total of just 0.248 Steem per vote trailer for the week. I doubt many would jump to trail the vote because of that with it being worth so little extra.
Of course that is just my opinion.

Why would they get 25% instead of 50%?

Even the first voter isn't likely getting 50% unless they timed their vote perfectly or the post did amazingly well.