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My MSD was wired "conveniently" - that meant they wired the +12V and switch to the hot side of the ignition key. When mine blew up (oh yeah, did I forget to mention that?) I wired it properly - power directly to the battery and switched power to the switched side of the ignition. My battery now lasts more than 3 or 4 days with the ignition key off and the battery cutoff in the "on" position.
So that's something for you to try - try turning the battery cutoff off and see if it lasts longer. If not it's the battery(batteries).
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