I would say that looks very normal if you are not using the Disk Space Equalizer plugin, which is a separate download. This is my order for balancers, and my data is equally distributed across all disks. The File Placement Limiter, also a separate download, allows prevent Duplicated and/or Unduplicated data from being place on individual disks, which is good when you have a disk that is on its way out and you don't trust it with duplicated data.