Hi Jeremy,
I am trying to use the cache-buster mechanism too and while it seems to work when I test in Chrome, I am not convinced that it works on a mobile device (I am using iOS 7) - it still seems to take a very long time to start the app on the mobile device so I don't think the cache is working...
Did you see an improvement in performance on you mobile device?
Thanks,
Simon
p.s. Sorry I can't help with you actual question!