In the case of the US edition of A HARD DEATH, my second book, I did an extensive rewrite, and then a thorough reworking of the copy-edited rewrite. It was, in the end, a satisfying process, but at the end of the day 1. I had spent a huge amount of time on a book I'd abandoned  more than a year ago, and 2. I'd been removed completely from the headspace of book 3, and have completely lost my stride on it.

Finishing reworking the copy-edited draft not only means you get to spend more time working on an old book, but it also signals the next stage of the process: the marketing. Right now I'm rewriting jacket copy for the US release of book 2, and thinking about who and how to approach for blurbs. And getting farther and farther away from Books 3 and 4.

I think the key thing with that summary has been helpfully italicized by David: it's astonishing how difficult it is to get rid of those errors and omissions...