I'm trying to print a 6 foot long piece with a 4 color black background, but keep getting streaks in the black. I managed to get one decent print, but have burned 18 feet of IJ 35-C in the process and still need another print. The magenta and black inks were both low, but I don't think that has anything to do with it. The streaks aren't head strikes, more like banding with lighter black, but in random sections of the print, different places on each attempt. The profile I am using is Avery 3100 190 quality 2 graphics 2, and it works quite well on smaller prints using four color black. Any advice? The installation is on Friday morning. If anyone knows the exact print profile I should be using, I would be eternally grateful. The print software is SAi FlexiPrint. If I can't get this to work, I am going to try it on the 1604.