I changed the NATS code to see if that'd do it, and I was able to find 3% difference. I don't see it "morphing," just changing a word or two here and there, though. Maybe when you're out of beta it'll be rocking and rolling. Kman will get you all straightened out, I'm sure.
Here's a good tool to check your feeds:
http://www.webconfs.com/similar-page-checker.php