Uninstall the bloat wear and add in an SD card of (16 - 32 or 64 gig),
also Update to Windows 8.1 , your main HDD is NOT meant for you to install everything under the sun onto, there's nothing wrong with your tablet , you just need to take the steps to get it where you want it
On the 32 GB model, it should have about 11.1 GB free, but perhaps you are getting only 8 GB free due to further Windows updates taking up more space? After you update to Windows 8.1 (free - due 9/17/13) you should have 14.4GB free.
Search Google for how to save space / tweak Windows 7/8 and you will find lots of things you can do to gain back some of that space.
Also, 64 GB microSDXC cards *will* work in this unit, and should take care of your storage space concerns.