It looks like a combination of nozzle deflection and clogging. Based on the list of cleaning cycles you have run
it seems like you have run out of options on normal cleaning.
You might try soaking the head overnight. There are some posts here where there is mention of a super strong
Epson cleaning agent. This post is a start. http://www.luminous-landscape.com/forum/index.php?topic=67241.0
From your picture it looks like Photo or matte black. Have you tried an ink switch? Thinking along the lines that the switching
might clear it.
Are you under base or extended warranty?
If you are under warranty, it's time to call Epson.