I think Rey killing her parents is still better than Rey Palpatine, but if I could make a version without some new revelation about her past, I would prefer it.
This. Focus on her future.
I mean, we could have both.
She could have visions of the past and future, her killing her parents and her possibly killing her friends, in fact her killing her parents creates a precedent, so the prospect of her killing her friends becomes all the more probable. Thus raising the stakes.