One thing that occurs to me is that, if you wind thread off one reel onto another, the thread is then going to be used in the opposite direction. I have always believed that the thread is one directional and should be used as it comes off the reel, Certainly when hand sewing, I have found that if you use it in the opposite direction, it is inclined to knot itself and drive you mad. Wound bobbins are, I think, designed to take account of this although they are, of course, the other way round. I have had problems on the machine if I've used a wound bobbin instead of a proper thread.