Roundness of the circle you're drawing. Try to draw perfectly round circles.

Do 10 circles one direction, then 10 the other way. Start by keeping your hands down low and 90 degrees to the side. Maybe start with smaller circles and gradually (over days or weeks) work towards drawing bigger circles. Experiment with angle from horizontal.

You can also vary the angle in front of your body, moving from poking straight out from you body to 90 degrees to the side. Again, varying the height from straight down to horizontal to the ground.

Note: I am NOT a medical professional, nor does this constitute advice. It's merely a recounting of what I did... after years of pain.