How many indexable pages do you have on the site and how many of those
are indexed? It sounds like you expect about 14,000 pages to be indexed
and around 11,000 are. Is that correct?

Looking at your site in the search results, it appears that your pages
would be well served by meta description tags. For most queries, the
generated snippet is based on where the query terms are found on the
page, and in those cases, your results are fine. But for some more
generic queries, where a logical snippet isn't found in the text, the
generated snippet seems to be coming from the first bits of text from
the page -- in this case, boilerplate navigation that is the same for
every page.

Is there a static link to every page on the site?