Ric,
What you wrote was my original understanding of Black Magic. How it did that, I did not understand either. When I first used it and for a long time thereafter, I seemed to get the expected results. In fact, so much so, I felt confident recommending it to fellow ballreview inmates.
However,
lately, the last 3 months, I have been using it less and less, because the results when using it have been more inconsistent. Maybe I should try some controlled experiments, but at this point in time, I cannot recommend it without some reservations.
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"Just because you can do something does not mean you should do it."