I have slowed mine down to a creepy crawl. I'm not into speed here, no high pressure for deadlines, no great volume, just quality product. I even roll out more than enough vinyl to hang down in back so it doesn't have any tug on the roll, don't use weed border, use restrict media, all that stuff. Still it will wander a 1/4 inch in 20 inch....very frustrating. And, like you, Jill, I'm using a lot more vinyl Wonder if those Graphtec guys ever read these posts.
I've got the old 4b sitting next to it and am trying to figure out how to run it from the pc. If we can put a man on the moon we can figure out how to get this pc or some cutting software to see that 4b. I'm only just beginning my search.