Wierd add targetting

Excessive emphasis on page url?

[Scruffy]

I have been having a problem recently that made me shut down adsense on one site.

Whatever I did, I couldn't get reasonable targeting.
I finally found out today that the problem (appears to be) the page url. For complex reasons the page filename is unrelated to content and I can't change it - call it footle.htm. So the url is www.mysite.com/footle.htm. Adsense seems to ignore the content, keywords, title, whatever and serves up any ad related to footle as a priority.

I found that the only way I can get on target ads is to create an iframe on the page and load in a separate document with the content, calling it mywidget.htm.
If I do that everything works and I get mywidget ads -loads of 'em.

Am I going mad? Has anyone else noticed this? Or is it just a 'feature' that no-one told me about?

[Frequent]

I have found that adsense heavily relies on url keywords when adsense is initially put on a page. Once the bot starts coming by targetting shifts to the content.

Freq---

[Scruffy]

I thought a t first it might be something to do with lack of botting. But the page and the site are cached in Google and hit #1 for the main key phrase in the SERPS.
I even let it run a few cycles with small changes to the page to check the cache changed and I used section targeting to no avail.

[WallyWorld]

I have a couple important pages that get ads for a subject unrelated to the content nor the URL words. I've tried using the section targeting and rewriting some of the content but nothing gets relevant ads on the page. I'm at a loss. I guess I'll have to email Google and see if they can fix it. They did this for me on a page some time ago and it seemed to work.