Unhappy [Q] How to change system partition on gs4 T-Mobile

Hi. I have a gs4 (tmo) running the latest Cyanogen Mod nightly.

I only have like 15 downloaded apps and my internal memory only hase 400 mb left. The system partition is only being used up about 30% and its 2.65gb. Also if I can re size the cache partition because its only being used up 13%.

I feel like this is my only solution. But if you guys know a way to clear up space other than telling me to delete my pictures and what not (because I already did), then please show me a way.

It you guys need more info please ask.

Thanks - Harinder g