I just took a class where the instructor said that Schmidt Microtex/Sharp Needles are really good to use for top stitching because the hole is bigger and they are really sharp and will help eliminate the shredding of your thread.
She also said to make sure that your thread is not old (even a couple years old can be old in thread) and don't use Rayon thread for quilting. She said that Rayon thread should only be used for decorative stitching since it is not strong enough for use in seams.
Also be sure that your machine bobbin area is clean. Lint can sometimes clog up the place where the needle goes through rubbing it until it shreds.
Check your tension on top and make sure it is not too tight. Also check that your bobbin tension is not too tight.
She said the best thread to use was Arifil, Superior, or Mettler, with Aurifil being her favorite, because they make the least amount of lint when sewing.
One more thing she said was to change your needle every two - three hours of sewing.
If all else fails, try slowing down with FMQ, if that is what you are doing.
That's all I got... Good luck.
Last edited by mac; 10-10-2016 at 10:44 AM.