QTR-Quadtone RIP

I'm a new QTR user, trying to make my first curve (Epson 2200, UCmk, 
VFA paper).  I'm confused about the instructions.  The help file says 
to look at the ink pattern page and determine "where the inks seem to 
max out -- i.e. fill the patch."  The user guide says to "look for a 
patch where it appears all the paper is covered with ink."  It seems to 
me each of these statements could be interpreted two different ways: 
1.  Find the first patch in which no paper white shows through, or 2.  
Find the first patch which is not noticeably lighter than the next 
higher patch.  These two interpretations would give me very different 
results, at least for the page I've printed out.  Even under an 8x 
loupe, most of the ink patches for the different color inks look solid 
(i.e., no white paper showing through) as low as 15-20%. Going by the 
second criterion, though, i would choose around 75-80%.  Also, should 
one give each of the seven inks the same weight in making this 
determination?  For example, there is much more visible separation 
among the LK patches than the Y patches.