I had the same problems with loops on mine but it wasn't the top tension it was the bobbin tension. Try taking out your bobbin hold the thread and let the bobbin go, it shouldn't fall fast or not fall at all, it should gently glide down. there is a little screw on the bobbin, gently turn it slightly until this happens. Different weight threads need different bobbin tension. Let me know if this helps with your regular bobbin. My LQS helped me set mine for 50wt, I haven't used anything else since.