I personally have noticed that the subpixel movement in AFX were of not very good quality(often they “wiggle” too much compared to other animated subpixel footage i have). You might want to animate a bitmap too since i noticed that enhanced the quality of subpixel movements.
Other than that, make sure the playback is done on a device that works with a refresh rate that is a multiple of 23.976(multiple of 24 should be fine though)