Depending on where the WR is lined up, say hes far right, you lead bullet pass to the right, and with the right stick, you push down, but not straight inbetween the left of the stick and the bottom, you want to push at an angle, and you should get the animation, same goes for the other side
and if they are on the line doing a streak kinda thing, jus pulling right stick down straight should do trick cus they are pretty much in line with QB, Its all about the angles