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In boxing, for example, in order to be quick you have to be explosive; the acceleration creates the "hardness" of the blow as an aftereffect. Actually the attempt to be quick can create the appearance of swinging too hard ...
Of course what you can do is remove load, get the lower body out of the equation, start from a more compact firing position. Seems to me that Zuumball has done that. Personally suspect pitch recognition as the culprit.
My $0.02. Good stuff.