It's not clear which inkset you're using when you say "quadtone". I've owned both printers, and still have fond memories of the 2100. I thought the build quality of the 1410 was poor. I had them set up much as you do. The advantage of using the 2100 for colour is that you get LK as well as PK/MK, unlike the 1410. Also, if you're using OEM, the 1410 is dye, not pigment. I can't see the value of putting a monochrome inkset into the 2100, unless you want to use K7, in which case I'd strongly encourage you to use K6 in the 1410, as shade 7 adds very little IMHO.
What inkset are you using and what papers are you missing profiles / curves for?