The corrections Choazman prescribed are on the right
Track. Some of the corrections depend on what you refer to as "spin". If you really are turning your forearm and wrist trhough the release point, you're probably right, as this creates a small, circular
Track with the axis tilted toward the ceiling. A way to check this, and get feedback to improve your release, is to find the axis point on the positive side of the ball and mark it with a small piece of white
tape. The object is to get the axis when the ball is released a little above half way up the ball and pointing back toward you somewhat. The more the
tape points toward the ceiling, the smaller the
Track, the more you are throwing a "spinner", which doesn't get into the necessary roll to grab and hook. Keeping your hand behind the ball more will help cure some of that, and the suggestions about the straight and cupped wrist help. The forearm never really needs to be turned, since you can **** your wrist to get the side roll on the ball. Side roll is not spin. It is necessary to get the ball to hook, through.