Have you had the printer profiled with the new inks, can not sort out the fading but colour is very unlikely to be correct if you use 3rd party inks with Roland profiles.
I use Activasol Premium and have had the printer profiled with all the medias I use (B&P also have used my printer to create new profiles via a third party) and my colours are spot on. The other part of a profile is setting ink limits etc, I ran my printer with Ativasol ink profiles and Activasol Premium ink in the printer and the ink was horrid it scratched easy and colours where no right Purple not Blue etc.
Had it profiled and different machine ink does not scratch and prints perfectly.
I have a banner out front of my unit that looks the same as the day it went out, only acouple of months but best fade info i have.
Regards
Russell.