The .ps module is an easy way to control your color and add some capabilities to your printer. But I would recommend getting a 3rd party RIP like Wasatch or Onyx to give you full control. Your print process times will be 2-3x faster than the .ps module, will give you complete control over your profiles and color management and will be a more robust tool. You can get an HP only edition copy of Wasatch for $1,500. Great stuff.