Internal storage has space but not /system directory. Help needed!!!!!!!!!!!!!!

Hello everyone. I am facing a serious problem. I have 500+mb in my internal storage but the /system directory has oly 5 mb left. I need the /system directory to be about 100mb free because i need to convert some user apps into system apps. Moreover i know that i can uninstall some bloatware to increase space but trust me i removed all the unnecessary apps. Since /system directory is a part of the internal storage is there any method to allocate more space to /system.? Screenshots included.

Space available to internal storage - https://drive.google.com/file/d/0Bzt...ew?usp=sharing
Space available to /system directory - https://drive.google.com/file/d/0Bzt...ew?usp=sharing