Zone Chucking and Leading Open Passes

Zone chuck/Uncovered passes: why is zone chuck so hard to activate? It only works 30% of the time, the other 70 % they either swim move or get an illegal contact penalty. And it just ruins the play.

And why do leading easy bullet passes to uncovered folks get overthrown like 20% of the time? Doesn't seem too realistic to me. 

Fix zone chucking please. Or if I'm doing something wrong? Ik you don't have to click it in but I strafe while attempting it too.