I think I have become a victim of the false positive. Some of my key words are still in good shape but several have gone into the tank compared to one month ago. One page was for now eliminated from indexing in the Google index.
I have made my changes to hopefully get the page indexed again but time will tell. The other major search engines are still returning relevant listings but Google change has effected a whole section of our business.
One main competitor who has a huge amount of duplication has been it seems unaffected. I applaud Google attempt to reduce the link/spam farms but in doing so they have caused search results to be less relevant than they once were in our industry.
Not much I can do at this point but wait.