Imagine the center of the ball has an equator, your fingers should be under the equator when you release the ball which will give you proper revs and rotation. When you are going over the top, your fingers are above the equator and most likely you are just spinning the ball. So concentrate on staying behind the ball with your fingers below the center of the ball and focus on making sure your thumb releases from the ball first followed by the fingers.
Here is a video of slow motion releases from all different pros, while they all have different motions the one thing in common is the fingers at the equator or below.
https://www.youtube.com/watch?v=7ZNVJql7hH8
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