I can confirm that my Adsense rep continually pushes me to be more agressive with my advertising. I've got 3 Adsense blocks on my pages, but I'm not using adlinks, and I'm not putting the search box as prominently as they'd like.
That said, I'm sure there are things I can do to clean up the site. Better author bios, research references, etc. I'm going to delete articles which are thin on content, like site announcements, etc.