Laughing @jonathan! Comes out publisher-ready… in our dreams!!
I understand what you mean about the ‘something bigger’s going on’ scenario. I had places where I could definitely see that happening and rewrote whole sections. And I also know what Jonathan means about being in a particular mood.
I think my rule of thumb is going to have to be whether it adds value to the text – ie improves it. I mean, I know that’s what editing’s trying to do, ultimately, but if the change doesn’t make any appreciable difference and I can settle for what was there before, maybe it never needed changing in the first place, IYSWIM?