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On one of our primary keywords Google is swapping out (about every other week) returning our home page, which is more transactional, with a deeper more information based page. So if you look at the Analysis in Moz you get an almost double helix like graph of those pages repeatedly swapping places. So there seems to be a bit of cannibalizing happening that I don't know how to correct. I think part of the problem is the deeper page would ideally be "longer" tail searches that contain the one word keyword that is having this bouncing problem as a part of the longer phrase. What can be done to try prevent this from happening? Can internal links help? I tried adding a link on that term to the deeper page to our homepage, and in a knee jerk reaction was asked to pull that link before I think there was really any evidence to suggest that that one new link made a positive or negative effect. There are some crazy theories floating around at the moment, but I am curious what others think both about if adding a link from a informational to a transactional page could in fact have a negative effect, and what else could be done/tried to help clarify the difference between the two pages for the search engines.

We have a company blog living on our corporate domain.  The blog contained many posts with keywords and we believe google is penalizing us for over optimization as we use to be ranked in the top 5 for our main keyword now we're on page 8.  Keeping this in mind,  we are planning to relaunch the blog and we wanted to get some tips on best practices that addressing the following questions.  Should we archive _all _of our previously published content and start fresh with this relaunch?  Should we keep 50 or so published blogs visible?  Where should this blog live (on our domain or a wholly separate domain)? We'd love to get thoughts and opinions, and any insight about best practices for a blog relaunch.