Well, I did decide to cut the scene that made up the second half of chapter 3, and after trimming what was left, added a trimmed version of what was formerly chapter 4 to make a whole new Chapter 3. That gave me a hole where Chapter 4 used to be so I decided to move the material in Chapter 6 into Chapter 4, which moves the hole to Chapter 6. The cool thing is that eventually it will make a place for the extra chapter I gained when I turned chapter 25 into chapter 25A and 25B.
Now I only have to rewrite the opening of the new Chapter 4 to get it to work in its new place and already I can see that that is going to make it a much stronger sequence.