backdraft7 - 12:58 am on Apr 7, 2013 (gmt 0)
I did several key word checks on data sets of 100 phrases each and all show improvement or the same in position. If the phrase is in the top 3 or 4 , they are quite stable while the lower on the page, the more bounce. Even with these figures, the ZERO periods (like a Zombie period without the visits ;^) are quite a mystery. It may be that all of G's April Fools shenanigans upset the data collection process of GA. Not sure I trust these recent numbers, but I will be cross checking again with p wik.