Also, how current are the reports from EWA?
You don't need a pixel on the advertising platform to figure out what's converting best if you're using P202. SubID's will do the trick. Also, you can use Keywords. If you're using an "Advanced" landing page, you can either take the link that P202 gives you and add a keyword to that or just use hxxp://www.YourLandingPage.tld/?keyword=PutKeywordHere
I like Advanced landing pages and keywords a lot. Probably my favorite way to track things.