donate any leftover money to CFAR, so as to avoid the donor illusion

Then there would be a partial donor illusion if people thought they were causing money go to effective charity that wouldn't otherwise when they're really just influencing how I divide money between the AMF and CFAR.

(This is all assuming I think CFAR is about as good as AMF. I haven't looked into CFAR enough to have a good idea on that account.)