What I do is lower feed dogs and if you can lower speed of machine and just put your foot on pedal and go moving the fabric if still getting loops try speeding up the machine usually if loops you are moving fabric too fast compared to machine at least that is what I found out. I cannot explain you just have to try moving fabric faster or slower or whatever works it does take practice and I am not any expert by any means. But it is different strokes for different folks.