Well as for your wife. Congrats to her on the weight loss. Can't really help with the question though because I do not know much if anything about vise it or turbo switchgrips.
As for your second problem. WOW that is pretty fast. A heavier ball will slow him down and I would definitely suggest a heavier ball. Accuracy does not necessarily have to do with ball speed. If he is muscling it he probably is twisting his wrist all different ways as well as having his arm in different positions when releasing the ball causing him to be inconsistent with his throw. But that may only be part of it, there are a lot of variables when it comes to accuracy and consistency.
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