I got delivered 2 sets of them drum mics by accident. The tom mics sound great on guitar cabs and having the two kick mics I now use one on floor tom with great results, tom mics are pretty good for backing vocals too. Bit of a bonus.
In a way it is kind of a rounding error. Thats how the intervals are tempered one twelth of the Pythagorean comma per interval but I know exactly what you mean. It's an eye opener and once you have it in your head a whole bunch of other stuff falls into place.