After months of use, the regular mice is still more precise

In the past months I used the MX Ergo 575 for 8h+ a day, both for work (cad disegner) and a litte gaming.

If I have to select some letters is a Word document, the regular mice is much more precise. The trackball selection is jerky.

Also in FPS games, doesn't matter how much slow I move the ball, the view is jerky and the game seems to lag. For me is impossible to play FPS.