I have my Epson C80 set as a dedicated sublimation printer, since I have the use of 3 others it’s not a problem.
Lorraine is right in respect of not changing from one form of cartridge to another. The main reason being if i recall correctly is that some of the ink remains in the chamber, and if changing from normal to subli would not give a vivid enough transfer. Even when you fit the subli inks for the first time its always better to print off a couple of A4 sheets (obviously at the lowest resolution) to ensure the subli inks are coming through the head and not the remains of standard ink.
If done visa versa, then the normal ink printouts would like very washed out.
From my experience the Rotech (Listawood) inks are definately not as problematic as the Sawgrass inks, in that they do not appear to clog the print head with pigment residue, and it might be worth trying.
I always print a nozzle check before printing out anything anyway, it’s cheaper than a lost A4 sheet. 😛