If the thread is shredding it indicates the eye of the needle is too small for the thickness of the thread.
Try using a metalfil or topstitch needle size 90 or 100. They also have a slot on the shank for the thread to nestle in whilst the needle goes through the fabric. Change the needle about every 8 hours of sewing. If you hear a popping sound as you sew, the needle definitely needs to be changed.