Jeff Wall's work is very probably on Duratrans (translucent RA-4 paper). The thing is you won't get a real black (even J.W. doesn't have em!)
I tried Duratrans and many different inkjet films and in my opinion Pictorico is the best, if you know how to handle it:
key is trying different profiles and messing around with the amount of ink applied to the "film".
It's a question of finding the balance between print-heads smearing around and getting dense/saturated colours.
If you can (depends on the printer/driver), try and print in single pass mode with maximum waiting time before the head goes on.