[MizunoJoe]

"acceleration could be added to a swing through a motion directly opposite to the direction of the centrifugal force during the release stage of the swing."

That sounds like the idea of lifting the handle through Impact. With Extensor Action, this will effectively give a manual uncocking of the Left Wrist by leveraging the shaft againt PP #1 or #3. This will slow the shaft rather than accelerate it.