I own a new 1500W. I used 2 sets of the original cartridges and everything worked as expected.
The problem I have is that after replacing the original cartridges with (refill cartridges not sold by InkjetMall) and the ink to Cone Color Pro I get messy prints with dark color (bluish, blackish) drips of ink on the paper. First I ran a nozzle check. It showed clogged nozzles, so I ran 2 cleaning cycles. At this point the nozzle check gave good results, however the drips were still there. So I completed a cleaning procedure using Piezoflush. Finally after about 5 more test prints (printing some regular photos) the drips disappeared and I sighed relived. Unfortunately as soon as I swapped the photo black cartridge to matte black all of my problems returned: drips on the prints and seemingly clogged nozzles after a nozzle check print. In addition what I observed is that the internal right side of the printer is sprinkled with drips of the same bluish, blackish ink. I am clueless, what may have gone wrong here?
Here are the answers to your questions.
"What ink are you using?"
Cone Color Pro encapsulated pigment ink.
"What style cartridges are you using: one part clear plastic, or two part Easy Fill key/capsule system?"
These are not Easy Fill as those don't fit the 1500w, but the newer - clear plastic on one side, blue label on the other - version that do not need priming at the first fill. I have ckecked the cartridges for leaks but did not find any. These are not INKJETMALL cartridges, but another brand of cartridge that I bought.
"How does your printed nozzle check look- are there missing or mis-firing nozzles, or drips on paper?"
Both drips and mis-firing nozzles as described above.
"What color(s) of ink do you see in the drips?"
"Have you cleaned your printer’s capping station, wiper blade, and/or bottom of the print head?"
Yes already twice in line with your video instructions.