Hey, I have Roland Sc 540 Ex pro II. I am having a problem with banding. No matter what I try to print it has banding. It is a small white line about every 1/4 inch. On banner, it's not as noticeable, however on vinyl it shows badly. I have cleaned, did test print, the black head is firing about 90%. I have tried many different profiles, when I use more than 720 the image just gets hazy. Any thoughts?