Powerdriver setting question

I currently print on polyester front, rubber backed mousepads. I use an Epson 4880 and with dye-sub inks.

I downloaded the powerdriver profile as instructed by sawgrass, and have been printing for a year now. The problem I'm running into right now is that I'm not getting consistent results. The colors will either be off, or the image as a whole will be dull, and I'm sure it's because of my powerdriver settings.

Currently I have my settings set to the following

Paper: 17 X 48
Substrate: Unisub Products
Paper: Roll
Color Options-
Bitmap- Realistic
Output: High Speed
Profile Options: Standard
Vector- Original

Options:
-Input Profile
-Input Color Space
-Custom

Custom Input Profile:
ColormatchRGB.ICC

Photoshop Print page
Color Handling:
Photoshop Manages Colors

Printer Profile- ColormatchRGB

Rendering Intent- Relative Colorimetic

If anyone can help me fix my settings I would be extremely grateful