Digital BW, The Print

I just received my CFS from MIS with ultratone inks for my 1280. My
concern about the whole system when I was getting ready to buy was
that I wouldn't be able to switch easily between matte and glossy
blacks, so after talking with them over the phone, the solution seemed
to be to keep black running on cartridges, and CFS on color only.

So here I am with the CFS installed in place of the color cartridge,
and a black cartridge in. The problem is that I can't put the tie wrap
over both the CFS color and the black cartridge, or I'll have to take
it off everytime I want to switch cartridges. And I can't put it
around the CFS only, it just won't fit. In addition, having the CFS
next to a regular cartridge does not really leave enough room for the
tubes so they're kind of stuck against the cartridge.

Was this setup a mistake? Is there a better way to deal with switching
between black inks? Should I stick to only one type?

Thanks!

Manu