The ToS specifies that you cannot have ads with pages that have forms (subscribe/unsubscribe), search results, etc... on it. Although you haven't been very specific, I'm assuming that those pages fit the criteria in the ToS that require you not to have their ads on those types of pages.
I have just begun to try to track some individual pages... I have over 1500 on one site, so it will take some changing around to get a decent idea of where the CTR is good or not. My real interest is finding out where those higher paying clicks are and then featuring that page/article on my main page!
My question is this...
How long is a good test period for tracking a page before you can be assured of the average CTR? How many impressions would make a "good-enough" test?