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If NearlyKeyword.com has a lot of links that do not duplicate the links of Keyword.com then I think that you will increase the linkauthority and domainpopularity of Keyword.com.  I would expect to see a rise in SERPs across the entire site. I would expect the same thing to happen in the opposite direction - if Keyword.com redirects to NearlyKeyword.com...... but I would put my money on Keyword.com as the stronger site to receive the redirect. What percentage?  I don't know. What does a keyword.com bring to me?..... The most powerful thing.  It makes me feel like "the man" in the keyword business and gives me greater mental energy to work on the site. That is a powerful force.

it does, thank you

All of our products have around 3-4 lines of individual text, as do all the categories. would you suggest that we start introducing individual text (where it is currently the same - see above) for the best selling products and see if it brings any positive change?