Jeff, the Piezography K6/K7 master curves have already gone through the partitioning stage, although it is much different than how QTR partitions the gray inks. .... In both processes the actual place on the x axis where the inks start and stop stays the same, but the values at the y axis are what change to arrive at a linear profile.
You were arguing that getting the ink limits correct for each paper type is important. If this is correct then how can the Cone custom curve creation process possibly work? There's only only master curve for each printer model. So you print a single page using the single master curve and send it off to IJM, and they send you a QTR curve. So there's no attempt to reduce or increase the amount of ink being laid down for each paper type to allow for differences in loading capacity. How can they have already gone through the partitioning phase when the ink load of the paper in question hasn't been measured? How could it work without this being measured up front?