The way to look at it isn't "when is this good in my off-hand?" but rather "given a number of available weapons, which produce the best results, and in what combination?"
Whether or not your Jade Mace (or any other weapon) is the right off-hand choice is entirely dependent on what other weapons you might be pairing with it. Your main hand benefits from a damage bonus based upon your level which may (usually) favors low-delay weapons. Also, your off-hand suffers the 50% proc penalty so your main-hand is the best spot for a proc you're depending on.
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