Standing waves are when a wave or multiple of waves are the same size as on of the dimensions of your room. They really only happen between parrallel surfaces (like a flat ceiling and floor). The fact that the surfaces are not highly reflective (aka bouncy) doesn't mean they are free from the effects of standing waves. The way you describe the problem in the last post makes me more confident this is a room problem.
From what I can remember about acoustic materials, wood has certain properties not man materials have. They will actually absorb certain lower frequencies while reflecting some higher ones. This could be adding to the problem too.
I would say the best thing to do is use a directional mic (for me I like dynamics for this) very close up to the the guitar. This will make use of the mics proximity effect, meaning the closer you get it to the guitar, the more bass response you would get. I usually mic the 12th fret or the neck joint. Then also try the over the shoulder technique with your small condenser and record to two tracks. The bass from the close mic might make up for the lack of bass in the over the shoulder mic.
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