How does the back look? Do you need to adjust the tension? Have you tried a larger needle? Still, it does sound like a "drag" problem - the weight of the quilt needs support on all sides. I have my machine on a table against a wall, so it puddles into the wall which helps. It's always good to make a test piece - use the same batting between a quilt sandwich similar to the thing you're quilting. That may help you adjust things to work better.