I just noticed this in your video ( looks like nobody else did either) was that the ball your using has a conventual grip. as opposed to a fingertip. That makes it a little harder to hook the ball like you see others doing.
The conventional grip lets bowlers insert their fingers into the finger holes down to the second joint from the top. This grip is usually the best for beginners because it gives a greater feeling of security and confidence when holding the ball. Also, this grip allows better control while learning the fundamentals of the sport.The 'fingertip' grip is the most used among league and better bowlers. Because the fingers are only inserted into the ball as far as the first joint, it increases the distance between the thumb and fingers, thus giving a brief extra time difference between the thumb and fingers being released, which allows the fingers to give more 'lift', so imparting more revolutions to the ball
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