QTR-Quadtone RIP

Hi all,

Since a few weeks I'm using the UT-3D inks on my 2100. I have 
created some basic QTR curves for EEM. Basically I copied and re-
linearized the UT7 cool and warm curves. Additionally, I made a 
simple black-only curve and a "neutral" curve, Partly as an 
exercise, partly since it allows spot-on neutral tones where the QTR 
curve balance is a bit more guess work (50/50 is apparently cooler 
than neutral on the slightly cool EEM). Partly I made this curve as 
well to have a good starting point for the next step: the use of the 
selenium/lab a/yellow position toner.

My question is the following. I do not grasp completely the concept 
of a "toner" (there is another thread in which the original poster 
has a similar problem). The lab a toner has essentially the same 
density as the warm and cool LLK toners (LC and LM positions). So I 
see the following options:

1) discard the warm and cool LLK toners and use the lab a toner 
instead as part of the "gray curves". I did this, works fine for the 
midtone/higlights, but I feel there should be more tone in the 
shadows.

2) as 1) but reduce the ink limits for the warm and cool LK toners 
(cyan and magenta positions), giving more "room" for the lab a 
tonerin the shadows. I am in the midst of setting this up, but my 
feeling is I will get insufficient shadow density.

3) set up the ink set as a 2K system (Eboni as K, combination of 
cyan and magenta positions as LK) and use the lab a toner not as LLK 
but as "toner". 


Is their a "best way" of proceeding? Or is it just a matter of 
preference?

Joost