I don't quilt for hire, but I'm pretty careful about looking at the finished portion of the quilt as I roll. There was a recent discussion on why you float your quilt top. Floating the top and batt allows me to check before I stitch.
It's probably sheer dumb luck that I haven't had to rip out a lot. I've caught my tension issues (eyelashing) that occurred on small areas when still on the frame and of course this is a breeze to take out compared to your situation.
Just put on some nice music or a good movie, and take your time.