QTR-Quadtone RIP

Two things.

First as someone who used the Lyson Quad Black inkset and then the
Small Gamut inkset for several years you should cut you losses and
move on to modern methods. To put it politely, these inks stink.
The metamerism alone, as well as the poor permanence of the "archival"
SG inks is enough without getting further into it. I had two clients
return neutral toned SG prints after 2 years because they turned brown.

Second, they are right, you need to be creating a color RGB ICC
Profile for the Small Gamut set, not attempting a greyscale rip
workflow. If you do go that SG route you need a decent color profiling
software and specrto to make the profiles. The newly designed
ColorVision PFP set up with the extened greys would neutralize the
SGAmut set well, but it will not remove the metamerism, the warming
under tungsten. 

Personlly I wouldn't use these inksets again if they gave them to me.
There are just too many really good monochrome inksets available these
days that makes struggling with all that obsurd. Even Epson K2 or K3
with QTR is well beyond anything Lyson has unleashed on us.

John