Try to use a full battery.  Performance decreases when the battery is low.  The Alexmos firmware does compensate, but eventually physics and chemistry take over.

Remove strap from camera.  This might seem obvious, but I left mine on initially.  It does make a difference because it throws off the weight distribution and aggravates motion correction.

Work on technique.  Gimbals are meant to correct errors in motion, but it does have a limit.  When I went at it hard, performance suffered.  You should not have to walk on eggshells to get it to work right, but it won’t work well with big harsh movements as well.