I have noticed my site again drop in ranking during the mayday update like other but not only for longtail but 2 phrase words as well. One of the industries biggest keywords and company dropping a significant amount of spaces down. This is big, my site results are back to what they were a month ago.
My theory is that to implement the caffine update right they are using an old set of results as it worked on x amount of search engines when they rolled it out the first time, why not do it again.
I guess tedster has a valid point that switching between 2 different data sets is effective which explains why at different times I see my website back to it's original rankings but this has been going on for a month now and all business are now suffering.
When will google stop this dance of engines?