Nothing very helpful to add but I had exactly the same experience with my WF7210 and CIE inks. The guys at CIE were really helpful and even replaced the printer at cost, but when the second one failed after a couple of weeks I gave up on the whole set up, ditched the printer (which felt awful as it was about a month old and HUGE!) and threw the inks out.
I bought an Epson 1500 from inkexpress together with their Inktec sublimation ink and a CISS system about 18 months ago, and have not had A SINGLE problem with it ever since. (obviously it will go t*ts up now - talk about tempting fate!).
I spent a long time trying to get the WF setup to work - all of it a total waste of time and effort..
I love the 1500 but I know it won't last forever (and I think mine must have been one of the last ones sold) so I'll be interested to see what other people recommend you get as a replacement (coz it'll be me soon!).
Good luck, hope you get it sorted. I really do share your pain!