So to be more clear for anyone else who stumbles across this:
Read the documentation, have enough RAM
Make sure you don't have the wrong directory pointing at by you CIFS (In my case I was transferring files, and playing with settings at same time, I changed my CIFS directory and name to ScreamDisk and ScreamDisk instead of screamdisk and screamdisk so some files ended up in different directories. (You can check this by doing: "ls -l /mnt/screamdisk/screamdisk" and changing it to the appropriate directories. also try with the same line but changing the capitals, or trying every name you changed your windows share to.
Make sure you don't change setting because 'they don't work' it takes time to apply, restart your NAS a few times then check if it worked.