Andem - 2:51 am on Sep 5, 2012 (gmt 0)
Maybe it's their new patent
Which new patent? I haven't heard of any new patent. If you mean the old patent that was recently hyped up by some Zdnet "journalist", then you might be on to something. The changing of titles and other page elements has been reported over the past few years as a cause of deteriorating SERP rankings.
Bounce rate up from 48% to 75%
It looks like you're using Google Analytics to analyze your traffic and a 48% bounce rate could always mean that you had a doorway page which contained a few words and then a big "click more" link which caused many users to click for more. GA bounce rates don't take time on the entry page into consideration if it's the only page they visit.
The point is the lower the serp ranking the worse the stats are regardless of the quality of the site.
Your point is very well taken. The more frustrated users are when trying to find something (ie. having to dig deeper), the lower they'll dig and the more likely they are to bounce from a page they found in the SERPs. It's no wonder the Adwords results seem to be better targeted towards the query.
Have you ever asked yourself why Google's profits have increased by an obscene amount since the IPO and subsequently more so after Page took over?
If your bounce rate has dropped by such a huge percentage, I believe that: a) whatever you're providing makes Google believe it can better serve their own interests in the form of Adwords; and b) whoever is visiting your site just isn't interested in what you're providing; you're getting the leftovers who haven't been satisfied by the [better] relevance of Adwords results [which are hardly distinguishable].