I've been in the SEO game messing around the search engines for over 10 years so when I say I'm a search engine man you would agree with me.

There are two aspects to Google's algorithms based on my own reverse engineer, assessment, and other third-party evaluations. Of course all solidified through my own personal experience.

Over the years experiencing personally firsthand more then several Google updates I can certainly tell you this type of pattern of bounce back is nothing new after roll out of a update.
Some Search Engine Wars Live through:

• Buffy — June 2007
• Caffeine (Preview) — August 2009

The best what to find out is bye setting up a split test. Things are always changing and regardless of what worked yesterday for someone they may not work tomorrow or today.
Something I do and teach in SEO is to constantly have isolated experiments going. This way, you can protect yourself from any algorithm changes.

I see that you are getting...