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I have also decided to index again the 260 pages than would cover for 90-95% of my traffic.
Yesterday (Sept 11th), I beefed up all pages with users instructions, meaning a minimum 250-300 words (prose) on all pages.
I'm guessing that this is going to be adding the same boilerplate content to all pages. This creates duplicate content throughout the site, which... on each page... will dilute your page-relevant, unique content, and overall gives Google a sense that your pages are all pretty much the same. The last thing you should do on a thin-content site is to enlarge the "footprint" of your template.
These instructions can be displayed/hidden with a click on new help links.
I have also removed small keyword lists I was maintaining in the footer to compensate for the lack of word content.
What you want to create is a large enough amount of unique, useful, and relevant content on each of your pages to engage your visitors. You want them to have a good enough experience on your site that they recommend your site, and that they will come back.
enlarging the footprint of my template
For the records:
- Google did not like the re-indexation of the 260 pages (90-95% traffic). Traffic vanished again.
- I noindex these pages again, and traffic came back.