QTR-Quadtone RIP

I've been experimenting with QTR on a R2400 using stock Epson inks to simulate the 
yellow/greenish look of palladium/platinum prints.   The "warm" curves provide the most 
yellow contribution.  However, I'm finding that with the provided curves I really can't get 
close.  The result does not have enough tint and has muddy clogged up shadows.  My 
biggest concern is the low tint saturation.  I've found that printing a color-tinted image 
using the Epson driver in color-mode gets me closer.   I'm a digital photographer and would 
really like the exhaust the possibilities of a digital simulation before I consider the real deal.  
Is my goal possible with QTR?  Does anyone have curves more suitable for emulating 
platinum/palladium?
   
Thoughts?