Thanks for the hint, June. Come to think of it, the areas where I've had the problems are in the curves of circles, so maybe I need to make my circles larger.
On another note, I've been quilting the body of the quilt on the frame, then taking it off to push through my machine to stitch in the ditch inside the border, then to quilt the border(s). Does anyone have any tips about how to quilt the whole thing, including borders, on the Gracie GMC Pro frame? I've only been quilting a little over a year, so still have lots to learn. Thanks for any help.