Shooting matches helps, but the real answer is to learn to control your relaxion, there are specific techniques which I tried to put in a reply but it was too long and the system rejected it.
It basically involves using a GSR (galvanic skin responce) meter to learn to control your relaxation, dry firing, mentalising sight pictures whilst relaxing with the GSR, combining with dry firing, and ultimately shooting wired to record the levels. It takes several months, is hard work, but it works.
My wife was coached in these techniques 30 years ago by a top US team coach, and it changed her air rifle scores from 350's to 380's.
That, and learning to be disciplined in not taking moving shots, stress causes sharper vision and a higher perception of movement which you try and correct. Just accept that you are seeing movement always there, its a bonus, relax and don't try too hard. If your zero point is checked at every shot, and it should be, it should be correct, if its not, adjust position, don't move the rifle to adjust.
Good shooting
Robin