Digital BW, The Print

After a year of struggle, I am giving up on getting a 2200 to run with a MIS UT7 CFS. On the rare occasions when I briefly get all 7 channels working, prints are very good indeed. But the next day a channel is gone, and once I get it running, another channel has dropped out. I've decided to go to individual refillable MIS carts, so that pulling a cart doesn't mean disturbing its neighbors. I was going to fill the empty carts with the UT7 inks, but on second thought I will adopt Paul's new C-6 setup, using MIS Base. 

Any recomendations on the 7th channel? Paul's recipe uses the M dilution twice. However profiling from scratch in QTR will be easier for me if I don't do that. I'm planning to fill it with base. An alternative would be using the sepia toner from the UT7 inkset.  

--John Wilton