The best advice I've read about that problem is, "Don't edit. Write." If you stop to edit yourself the story can lose momentum. Books and stories aren't written, they're re-written. If something isn't working right in a story/novel it can be fixed in a re-write, but only if the words are there to start with. Middles always sag as I understand it. What's important is getting the words down on the page to begin with.
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