It took me a while to understand your code. The Aim_Analog_Dev is moved with Bullet behavior and you are using lerp to return it back to the player. As a result, Bullet and lerp are "fighting" with each other, that's why you have the jitter.
That's a weird method and I don't recommend using it.
You can do the same easier with MoveTo behavior. Remove Bullet and events 334-337. Add MoveTo, you can experiment with speed and acceleration/deceleration values. 300 in the screenshot below is the max distance to the player.