At the moment I'm concerned about the orange position with piezoflush carts. After I get that going again, I'll try the Sel again.
I just removed the orange piezoflush cart, used a priming tip and pulled about 5-10 mL through the cart, refilled the cart, and replaced it back to the printer. The R2000 does an automatic head clean, then I did another nozzle check. The patter is back to normal. Perhaps these carts need priming each time. This will be frustrating. Also, my GO position emptied before I got a low ink.
I have other products from inkOwl, but I'm not sure I can recommend these carts for piezography at the moment. They may be fine for other applications, but I'm surprised I had trouble with piezoflush too.
Yes, I did remove the air vent plugs.
I'm going to try the SEL again, but prime each position before inserting them.