Your P420 bass cut starts at 300 hz at 12 dB per octave.
It's very common to cut around the 200 hz area in acoustic guitar recording. So the bass cut in your mic is doing something similar.
You mention proximity effect but didn't describe your position in terms of distance from the source. Proximity effect is present in directional mics for as much as 30 inches or so.
As far as the improvement with two mics, most of us find using two mics gives us a more satisfying recording.
Fran
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