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One would think the line levels should be the same
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The connectors (TRS and XLR) share the same differential amplifier, so there should be no difference in using either jack on the BFD. The shorting of the minus (-) input to ground of the differential amp raises the gain by 6dB to account for the unbalanced usage.
In fact, the 'quasi-balanced' configuration you reference that mississippi used is fine for reducing hum (if it's a problem), but suffers from not engaging the 6dB gain function.
If you aren't experiencing any hum problems, I would probably just use the RCA to TS plug, since that seems to work fine in your case.
brucek