Samsung Galaxy S4 — primary external memory+s4 root?!

hi@! took the plunge and rooted my s4 16gb, it seemed to work seamlessly. I rooted it the microsD way. and installing terminal emulator.

that being said.
its glitchy the F out!! it restarts when I launch apps or make changes, and in my application manager it says :
Device memory
3.8 GB used
6.0 GB free

I have moved almost everything that I have over to my sd card, and uninstalled go launcher and all of its components.
I dl Apps 2 SD, and titanium. I also downloaded Apps Manager, and when I got to "movable" it gives me this message
"The device does not have a real primary external storage, or the primary external storage is emulated. Moving applications to the EXTERNAL card function may not be supported by this device "
(it is only when I use this app, do I get this error. Apps 2 SD, etc does not prompt the code)

so here are my questions!!
1. After using my 2gb micro sd ( which was formatted to exFAT) was I supposed to do something as in write a new script in the terminal so that when I mounted my 16gb microsd it would utilize it properly? like a pc, when you reformat the drive?
2. Where the frap has all of my memory gone?
3. Why would my phone restart when adding, or changing apps?

xoxoxo
I appreciate all you tech savvy boys out there.. and girls!!