Andrew,
While I have a 6D, I don't use it for AP, so I'm probably not much help. But those values seem sane. Even if they're completely wrong it's not a big deal. The Gain is used to calculate "best exposure" in the metrics view. Pixels is generally used for the Framing and Mosaic wizard with scale. Really "scale" is likely the most important if you're going to be plate solving.
As for the FITS + RAW just keep in mind that this will be saving 2 images and can eat up space fast. It's not a bad idea to do that initially though. You'll likely find that you prefer one or the other for processing eventually.
Thanks,
Jared