I just added some higher paying target keywords and my earning have already quadrupled today...The higher paying keywords take up most of the ads but there is still a few ones that are relevant to my site but it doesnt seem to matter to my visitors.
Could you tell us (or PM me) with the targeting category you're using? I've been experimenting for weeks now without any noticeable increase.
Are you talking about add targeting or onpage factors.. i.e. Title h1 and 2 bold key word density etc. Care to share the types of changes that made the impact.?
You can do either or..simply adding the keywords but not necessarily changing any titles...just experiement and you'll figure it out..