The charities themselves rarely do that directly (unfortunately, as the OP said, the incentives are really messed-up so they would never do so), but GiveWell does it "by proxy" every year, so if you donate to GiveWell's "general fund" you can be sure that they're iterating and correcting for failures.
In terms of other feedback, I have to say I really like the clean separation of "ends" and how you can pick which one(s) you want. TBH, I've been getting increasingly annoyed at how the X-risk people are gradually taking over EA, but I don't want to just quit or blow up at them either (they mean well even if I think they're misguided). This looks like a way that everyone can be happy. Please don't let them needle you into adding that stuff into the Global Development or Animal Welfare funds.
In terms of other feedback, I have to say I really like the clean separation of "ends" and how you can pick which one(s) you want. TBH, I've been getting increasingly annoyed at how the X-risk people are gradually taking over EA, but I don't want to just quit or blow up at them either (they mean well even if I think they're misguided). This looks like a way that everyone can be happy. Please don't let them needle you into adding that stuff into the Global Development or Animal Welfare funds.