+1 for the earlier comments about zoom magnification amplifying control inputs on the screen.
Because of problems with things "twitching" when I was zoomed in, very early in my AH career I mapped the zoom in/out controls to a hat switch on my joy stick. Now I can make adjustments as need without taking my eyes off the target. Most of the time I only zoom in when the target is >400yd, and only for as long as it takes to take the shot.