Sorry I just re read your post and you say you are using the CMYK on the right side. Does this mean you are putting yellow in the LK (middle) slot? Previously, I thought I would use the oem yellow slot for yellow (3rd slot left side). Any benefit from having the left side all white (is it due to nozzle cleaning pairs etc)? Also, when you say you are using a cleaner cartridge for the Matt Black, does that mean you are just filling up a refillable with cleaning solution or is there a specific cleaning cartridge. I do have the OEM carts still, is there any harm in leaving the oem matt black cartridge in there (same as the channels left blank).
Sorry for all the specific questions, as usually I'd just go with my gut instinct and do whatever, but having broken so many DTF printers, I've learned sometimes its best to learn from the pros before trying things on my own since the parts for these things are rare and often expensive. Learned my lesson breaking a 5K Canadian DTF station A3+R which was pure junk and such an over priced POS.