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i was going to post something but because i dont know the whole stategy yet it dont want to post mis information. I will let visconti chime in.
To my knowledge knock learning in the positive is fine, if knock correction(negetive) is present a small amount of timing will be taken away from the knock learning column which will in turn reduce the total iginition timing used.
What you are describing soundwise does not sound like pre detonation(knock) but rather something mechanical.
Pre detonation or knock correction typically cant be heard unless it is quite bad and even then it would happen under load, not free reving.
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