I don't know if I'll win or not, but either way, I appreciate the advice and the opportunity.
I also rewrote a significant segment of Wisps of Memory, to patch a plot hole I accidentally introduced when some characters started seeking information that they'd already gained via a scene I'd added earlier in the book. Whoops!
I swear, dialogue is like dominoes; each piece sets the next in motion, and if you remove or rearrange them, it creates a gap that ruins the whole thing. I tried to patch it neatly with a minimum of rewriting, but it still felt awkward.
Partway through that effort, I realized that, if I let go of the original version and heavily rearranged a certain series of questions, I could build organically and ominously toward a revelation that would shake some of the characters to their core.
So while this plot hole slowed me down a lot, the process of fixing it greatly improved the tension and the resulting "Oh, SHIT" moment.
I'm rereading the parts of the dialogue that follow that moment, to make sure there are no lingering offshoots of that plot hole, and then it's onwards and upwards!