Hi Alex,
From the looks of it, there seems to be a lot of 301 redirects going around. As far as I am aware 301 redirects dont always pass 100% of the weight accross to the new URLs. There is some sort of decay factor involved.
There also seems to be the case of the main links to the site passing through two 301 redirects. This is possibly one of the causes of drop in site strength.
What may be worth considering is checking how many links point to the main URL, rather than links into the redirected URLs.
Was the site fine before the 301 redirects were implemented?
Ben
