QTR-Quadtone RIP

Hi, my name is Martin Herrera.  I'm a documentary photographer based in Montevideo, Uruguay.  I started testing QTR to print Black and White, using UC inks (for the time being).  I managed to setup and print using QTR from Photoshop, yet when I print from Aperture, what I get looks more like a negative than the actual print.  

I've checked all the setup of the RIP, and used the same setup than in Photoshop.  Details below.  

Printer: Epson R2400.  
Inks: UC.  
Paper: Ilford Gallery Smooth Pearl Paper.  
Black Ink: Photo Black.  
Printing Profile: QTR_Gray_Photo_Paper. 
Black Point Compensation: yes.  
Rendering Intent: Perceptual.  
Curve 1: UCpk-IlfordSmooth-neut. 
Curve 2: n|a. 
Curve 3: n|a. 



You can review the photos section, where I created a gallery and uploaded a sample file (quick iPhone shot of the print for reference).  The Gallery name is 'Issues Printing from Aperture'.  

Thanks so much. 

Here is the link: http://groups.yahoo.com/group/QuadtoneRIP/photos/album/1123946900/pic/1048174203/view?picmode=&mode=tn&order=ordinal&start=1&count=20&dir=asc.