first off from what other writers tell me, and from personal experience I can see this being a failure point. With all artists, of which I have dabbled in just about all areas of creativity, there is an air of perfectionist within us. When we come to a point and the story gets to feeling drab, we want to write the perfect words to give the story excitement and that extra something. When we don't know exactly what to write, the downfall is we just don't write. That's right, we quit writing and call it Writers Block.
The only cure for writers block is to just keep writing. Write and write and write. I mean if you hurt your leg and it is feeling stiff, you have to walk on it to get the stiffness out, right? That is what writers must do. Keep writing and get the "stiffness" out.
You might say "I write like crap when I get to this point." My answer to that is, we all do. You can't be perfect 100% of the time, but if you wait for inspiration to write great, your book could take much longer to write than is needed, or it will never get finished at all. Besides when I finish writing, and I look over the areas where I wrote though the stiffness, it sucks, needs to be edited and is a chore, but... I only know of one instance of this that the crap I wrote did not inspire me to write something else during editing which made editing much easier. One of my favorite scenes in my story started with writers block writing and then an inspired idea during editing.
Ask any writer you may know, or have access to. They will tell you the same. You can not let perfectionism stand in the way of publication. Keep writing