Originally Posted by misspix
Some of the problems you mention are talked about at different thread manufacturers websites and a lot of them recommend the use of a topstitch needle for FMQ. I have had a lot of the same problems myself and haven't tried the topstitch needle yet. I have also learned that there are different needles that should be used for different threads. You might want to check on that... it might not be you or your machine but the needle and/or thread. Good Luck.
I tried using a 14 top stitch needle as recommended for King Tut thread but had persistent thread breaks. Changed to a 14 quilt needle and the problem disappeared!