You can see I had lots of stitching trouble on this quilt. Examples of how I tried to improve the bad bobbin threads. (Not even the worst but had already fixed them.) I had to pull on the top threads that ended up pulled down and then tug the loops along the stitches to spread them out (so the top threads aren't pulled as tight/are looser but still lay flat). Clear as mud? Not foolproof - I did break some threads requiring another kind of fix.