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There are a number of factors to consider. The links: (i) Can take time for Google to pick them up. Are they showing in your webmaster tools? (ii) Do the links have a nofollow tag? (iii) How competitive is the first page ? (iv) In one of the latest SEOMoz reports, it has been suggested that exact keyword usage in anchor text may be less effective than broad usage. (v) How many is double ? from 1 link to 2 ? (vi) On-page content good? Refreshed it lately ? It is fine to redirect the non-www to the www with a 301 redirect. Hope the above helps!