did you start with spreading out the backing smooth --tape down, smooth batting over it...smoothed nice and flat...then top added to the sandwich...pulled nice and taut (but not stretched) then you need pins at least every 4"...such as each time you place your fist on the quilt 4 pins should be close to your hand...top, bottom each side. when put into the hoop make sure it is wrinkle free, smooth- then loosen the hoop so you can quilt. there should not be any....pulling it tight??? don't quite know what you are trying to do there...
any pictures of the quilting problems? we may be able to help further if we see just what the problem is.