Hi Hoser, I am not sure about this (Language problem). As far as I know from books, "hitting on the ball" means that you artificially try to put rotation on a fingertip ball so much, that you rotate your wrist and end up with the hand coming awkwardly "around" the ball upon the release. This is wrong and even har´zardous to your health!
Ball rotation should only come from your fingers. Your wrist has to be kept stable. You may change the side turn of your fingers/hand, but never try to make the ball spin from your wrist - your wrist will not last long! This will become even more complicated if you use a wrist device which should prevent you from hitting up on a ball through a stabilized hand.
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DizzyFugu --- Reporting from Germany
"All that we see or seem, is but a dream within a dream..." - Edgar Allen Poe