Okay. So the way I understand this works now is the self-upvoter keeps all of the rewards that they give themselves within the first few minutes of doing so, including all of what would go to curation, with diminishing returns up to and then through the 15th minute, as well as getting up to all of the portion of the curation from the upvote of others depending on when they place their upvote.
If I am understanding that correctly, that means no one upvoting now should do it within the first 15 minutes if they hope to have some of the curation rewards.
With HF 20, the way I understood the change would work is that the portion of the self upvote that could be set aside for curation after a few minutes through the 15th and so on will instead go to the reward pool. Now, you're saying that anyone else who votes within that 15 minute period could have at least portions of the curation reward end up back in the reward pool and distributed to the posts with higher rewards, too, which if such is the case, is pretty self-defeating.
I guess I'm going to need to go back an reread the last few updates. Also, I believe the window is being reduced from a total of 30 to 15 anyway. Haven't seen that talked about lately but it was in an earlier update.
Regardless, it seems to me that this could be more readily solved if instead of returning to the reward pool, the allocation went to curation for that particular post. Since some of the higher SP folks are asking for a 50/50 split to encourage more curation, this change as described will be taking a step back.
RE: This has been a demonstration of optimal posting strategy under Hardfork 20.