I have a Janome 6600, and find it vibrates quite a lot when I have it on a banquet table, but barely at all when it's in it's sewing table. I FMQ at about 3/4 speed, and use the start/stop button.I'll go slower if the design is more intricate, but find my curves are smoother at a higher speed. I always practice the designs a couple of minutes on a scrap sandwich before heading off on a quilt. I use Connecting Threads Poly almost exclusively, and am very happy with it. Good luck on your FMQ journey.