Quilting gloves. Fast machine speed and slow even movements are the three things that will make a difference. And you don't have to spend a lot... ladies gardening gloves with the pebbled fingers will do to start.
Hands flat on the fabric and think of it as writing... scribbling curves.
Before I start and do FMQ I take old newspapers and a marker and I doodle and doodle and doodle... 10 minutes sometimes. It helps to relax me and it also creates what I think is referred to as muscle memory...