When you were getting the "very boomy lower-midrange-heavy recordings" were you using a cardioid mic(s) as you are now for the two mic setup? If so, you may have been experiencing the results of the mics proximity effect. What distance were you micing at, and where was the mic(s) pointed in that earlier setup?
Also, you may get more interest/responses to this thread in the Record subforum.
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Chuck
2012 Carruth 12-fret 000 in Pernambuco and Adi
2010 Poling Sierra in Cuban Mahogany and Lutz
2015 Posch 13-fret 00 in Indian Rosewood and Adi
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