For many light A/C the speed for Vy is often very close to the speed for best glide. Obviously, when an EFATO occurs, you want to have as much time as possible on your hands. Failure to pitch over without delay, may result in an increase or decrease in airspeed. Deviation from best glide speed will cause you to squander height and therefore time. In my opinion, the first action should be to pitch over without delay and adopt the glide. Finding the A/C in trim, is an added bonus!