I have many adwords campaigns in the same account. Since i used to get low quality score when using landing pages, i switched to using real pages from my sites as landing pages. But still, i get quality score OK for my words, no matter how many ads i write and how little keywords i use for each group. My ads are containing the keywords but not too much. The campaigns are for American sites. Can it be that Google doesn't like our sites? Please help me.
If it is a relevancy problem, try including the keyword you want a better quality score for in the title of your webpage, perhaps in the heading as well. Google will think your website is a better match for the searcher and give you a better quality score after a few days hopefully.
When you switched from the target to the landing page to the content page did the target page have the same name? I have long wondered if google caches pages it has reviewed to calculate the LPQS. Could be that.