I accepted the option Amazon offers of choosing a foreign royalty payment that’s the same as what Amazon pays for US sales. There were a number of things on the Kindle Direct site that caused me to choose that option.
I’m now convinced that was wrong and I’ve been giving Amazon more of the money from my sales than I should have. The ‘delivery charges’ turn out to be quite small; even my longest books don’t push into extra delivery charges.
So if you’re an author, I suggest you choose the largest percentage that Amazon offers.
I suspect my mistake has probably cost me at least $100 by now.
Just remember, if you’re an indie publisher? Make every decision yourself, and do the necessary research before you decide.