JPEG quality export settings and anticipated results can be darn confusing. The following two articles shed some light on the considerations involved. The second from the blog of Jeffrey Friedl is especially interesting and helpful with regard to Lightroom.
http://petapixel.com/2011/08/26/a-higher-quality-setting-in-photoshop-sometimes-reduces-jpeg-quality/
http://regex.info/blog/lightroom-goodies/jpeg-quality
Enjoy and happy photo trails!
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