I agree that 50% curation could turn out to be a bad idea. As a content creator i feel that the loss in post rewards is biger than any gains in curation and extra votes.
I would like to suggest a change in the distribution of curation rewards within the existing 25% system instead. If early voters (like in the first 30 minutes) would get an even bigger share than they do now, you would shift curation rewards from vote sellers to actual curators and by doing so stimulate curation as well.
If voting bots were not to cast votes within those 30 minutes, users would be stimulated to beat the bots and vote early. Users from bots who do not comply to this 30 minute rule could be corrected from downvotes from the coming downvote pool.
I think this would create the same results, without harming content creators.