Are you using double thread or single? I use one strand of good quality thread for hand sewing binding and on't have your thread too long. If you find your thread doubling back when sewing, you are turning the needle as you sew. Hold your quilt up with the thread and needle dangling and let the twists spiral out and then resume sewing. I do a double knot on my single strand of thread close to my work and then pop it into the sandwich.