You are answering your own question... you have been listing the non www and obviouly some have been to the
www... your recip links are going from the www address I would imagine... it has been the return links that have lowered the www ranking as their reciped inbounds have lost their count to your PR.
Florida downscaled the value of recip links... thus the non www which I am think does not have as many of your outbound links, is getting the better play... your competitors are in the same boat but do not have the non-www and have lost ground compared to you