Of the things on the list, the redirects jumped out to me as the most likely culprit. Second guess would be the algorithm change. You could look at individual p

Of the things on the list, the redirects jumped out to me as the most likely culprit. Second guess would be the algorithm change. You could look at individual pages before & after - mainly the top performing few, looking at what queries they ranked for before and now, and what their average position was. Hopefully the fix to the redirects will kick in soon!