Hal, did you decide on this change that you mentioned earlier:

“Maybe add Palpatine telling Rey “kill him” when she beats Kylo, which is an internal voice she hears in the novelization (though likely not intended to be Palpatine per se).”

I really like it, because it suggests the idea that Rey has some internal struggle with the dark side, which I think makes her character less perfect (more conflicted). It also would give us the first hints of the “force talking” mechanic that is so prominent in The Last Jedi.