My opinion, your throwing hand should not be at your cup, but behind the glove. When you receive the ball, let the ball momentum, with the guidance of your left arm guide the ball and the glove up towards your right shoulder while rotating the glove, so that your hand can simply grab the ball and release (this is a quicker way to get the arm into the throwing position). The ball has to cooperate (meaning your pitcher needs to target better for video). Also, get your pitchers phone to record the ball coming into the bag, so you can show both views. Good luck!