That I can't speak to, since I don't really know much about the Kindle (or the model involved). However, I am looking to trim down the PDF significantly, and hopefully that'll help when that happens. Right now I have a interstitial version that's smaller, that might help, but isn't ready for general release; if you contact me at jkgames@gmail.com, I can send that over to you.
I don't have a precise timeline because I'm very, very busy with getting the first expansion out (Mutants in the Next) finished, but I'll post an update when the trim version also gets a public release.