Digital BW, The Print

I just tried using both QuadTone RIP 2.0 and Gimp 4.2.5 for the first time with 
my Epson 2100 inkset. When I used Quadtone RIP my image came out 
extremely dark. So I then tested it with Gimp 4.2.5 (which I had to download to 
install QuadTone) and the image came out very very light in tone vs what I 
see in Photoshop. What am I doing wrong? 

My working space for the image in PS is Dot Gain 15. I am printing to 
Somerset Enhanced Velvet  paper. I am using the Epson matt black ink. My 
print space is set to SP 2100 Watercolor - RW_MK. In Gimp (and Quadtone) 
Printer Features the Basic Settings are set at Matt Paper (there is no 
watercolor in 4.2.5), 1440x1440 DPI Highest Quality, Photograph, Adaptive 
Hybrid, 7 Color Photo. The Quadtone Settings are 
Quadtone RIP and I am using a curve which is simply a duplicated and 
renamed (printer to correspond with the printer list, profile name to 2100-
neutral) example curve provided by Roy (2200-neutral).