I machine quilt only. You have to pin it with safety pins and I mean pin. My last quilt I used 300 pins, it was double bed size.
You have to use a walking foot as well. Make sure when you pin it your pins go all the way through. Make sure that your have the wrong side smooth before you start. It sounds like your bobbin might need some attention . Your thread should be machine quilting thread. When you put it under the machine keep it smooth. This should help if you have anymore problems just let me know and I will be glad to try to help you. Good luck and keep on going don't stop!