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I may be completely off base here, but I think that it has nothing to do with the frequency response of the mics or the spacing. My suspicion is that the mid range buildup you are hearing is actually coming off the bottom of the piano. For as long as I've been recording piano I've almost always found that the energy off the bottom of the soundboard reflected off the floor needs to be adjusted to balance the clarity with the warmth of the instrument. A little bit of absorption under the piano goes a long way.
All the best,
-mark
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