I get my best FMQ on my mechanical plastic 12 year old Costco variety Brother machine with a horizontal bobbin. The feed dogs do not drop so I set the stitch length to zero. Don't have a tension problem and it takes any kind of
thread. I don't get eyelashes with it. But I can tell by the sound of the motor where the "sweet spot" is. Maybe it just takes practice on any machine. I have plenty of vintage machines. I'm going to see how it goes on the 301.