Try starting the game while the mouse cursor is dead center of the screen. Move the cursor to the middle of the screen first, then press Alt-E, P.
The cursor glitches while the game is running maybe because the cursor is relative to the current window that it is above. The other possibility is that the game is trying to center the C Stick, but since you're using a mouse cursor, that makes the game retry over and over again.
The cursor glitches while the game is running maybe because the cursor is relative to the current window that it is above. The other possibility is that the game is trying to center the C Stick, but since you're using a mouse cursor, that makes the game retry over and over again.