I am not a physist, but this does not make sense.

The spin of the ball causes the lift (Magnus Effect). The other major forces on the ball are gravity (pulling it down) and drag (slowing the ball down). If the spin is reduced then the lift is reduced. However, if the speed of the ball is reduced with the same spin rate then lift is increased.

I think this is the cause of the "ballooning" at the end of a "pro" drive. Immediately after launch the ball is travelling so fast and the spin is so low that the Magnus Effect is minimized. The ball slows down due to drag, but the spin rate has not slowed down as much, so additional lift at the end of the ball flight is achieved, hence the ball rises at the end.

I find that the best way to think about the Magnus Effect is look at the back of a ball and imagine an arrow (or use your index finger) at the front of the ball pointing in the direction the ball will travel due to lift (or spin). The arrow would point straight up if there is only backspin, but point right or left if there is only sidespin (hence slice or hook), and somewhere in between for a rising slice (like I seem to get all the time). If you have more spin with the same ball speed then the arrow is bigger (more lift). If you have lower ball speed but the spin is the same then you achieve more lift.

Next time on The Science Guy, we will be determining the exact reason why knowing all about the Magnus Effect has not cured my slice.