Your objections seem to me to arise straightforwardly from a disconnect over the definition of "you". Taking DW's position, and your axiom of unique self, I can resolve the issue by saying something like:
Knowing that you can never be certain which branch you will end up in, bet on the outcome that maximizes the liklihood that you will end up in a branch you favor. Your bet, of course, will follow the form of the Born rule.
Knowing that you can never be certain which branch you will end up in, bet on the outcome that maximizes the liklihood that you will end up in a branch you favor. Your bet, of course, will follow the form of the Born rule.