JS_Harris - 8:52 pm on Jul 31, 2013 (gmt 0)
User metrics are not the only ranking factor and likely nowhere near as powerful as backlinks, I have a well ranked single page information site as proof. It has a 100% bounce rate as you'd expect from a one page site. For that reason the testing you are doing is hard to derive actionable data from but still, thanks for sharing!
Just thinking out loud here, I wonder if the higher conversion rate/improved metrics over the last week may have tipped our site profile from informational to eCommerce.
Probably not, if there is a product on the page it's virtually guaranteed to be treated as eCommerce and have to fight sites like Amazon. I have seen many informational pages about products get treated as eCom pages and fall 50 places in rank due to the sheer competition involved for the product. About a product = ecom even if its information about the product. About something you can do with the product = informational. Google's been polishing their detection on each.