You're not annoying me, honest, that's why I shared my results here ;P
1: Android System is currently 13%, screen is 29%. Previously Android System would be over 30% no matter what and often much higher if I didn't use the phone much that day.
2: Copy everything off your SD card onto your computer using whichever method you currently use. In Kies there's a file browser icon that lets you browse the contents of your phone, as well as copy things to and from it. You don't have to use the automated sync tools in Kies, you can simply drag and drop using the Kies browser.
3: Yup, that is correct. Not sure if it's maybe formatted using exFAT now, but I believe that's Android's preferred format these days.
Sent from a Galaxy 5 light years away