Hello, my name is Tom, and i understand the problem your having. The issue you have cannot be fixed, you can't cross track 2 domains with Adwords/Analytics, i had this issue with one of my current clients.
We solved it by implementing a following scenario.
We sent traffic to page 1, where page 2 had all the relevant tracking set up, when people came through the iframe to page 2, we would see the stats for those visits.
Hope this helps, free advice for you
Cheers : )
Tom