QTR-Quadtone RIP

having printed the initial Ink separation page and selected 80% as
the overall Ink limit, for a given Ink/Paper combination in 
question; I then print a second Ink separation page (in calibration 
mode of course) with the Ink limit slider set to 80%.

question:

the initial overall Ink limit of 80% was chosen because the black 
ink maxed out at 80%, however non of the other inks maxed out on the 
initial 100% ink separation printout. So when I produce my second 
Ink separation page (in calibration mode) with the Ink limit slider 
set to 80%, the black ink is printed as one would expect (with a nice
gradual increase in density, until it max's out at 100,) however, 
because I have set the ink limit to 80%, all the other inks printout 
with a reduced density when their individual densities where fine 
with the initial 100% Ink separation page.

So should I set the default ink limit in QTR curve creation to 100% 
(so all the other inks are at their max,) and set the Black ink 
limit to 80% as established above.

Hope somebody understands what I'm getting at, and I would like to 
hear if anybody builds curves with this approach, or does everbody 
follow Tom Moore's excellent user guide procedure, which sets the 
overall hardware ink limit to all inks (if I understand it 
correctly,)

regards,

Jamie Creed