Hmmm. You might have to quote specific sentences. I'm not sure what you're getting at.
In general, however, more and less operate the same way.
Here are a few examples.
This report has [more/less] importance than the other.
This student shows [more / less] anger than the other.
We'll need more creativity to solve this problem.
Let's use the new procedure. It creates less confusion.
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The stream is less (of) a river than a creek. = less like a river than like a creek
The storm was more (of) a hurricane than a tornado. = more like a hurricane than like a tornado
-- What were you eating? Was that a stew? -- No. I'd say it was more of a soup.
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not much is a common combination.
This is an easy problem. It won't take much creativity to solve it.
The doctors don't hold out much hope that the patient will survive.
Unfortunately, Henry's new job doesn't have much potential for advancement.
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It wasn't much of a lake. It was more like a muddy pond. (It didn't have as many characteristics of a lake as might be expected.)
It wasn't much of a movie. It only lasted half an hour.
There wasn't much of a crowd at the demonstration. Only fifty people showed up.
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CJ