Well, the 2i2 48V phantom power mic interface is balanced, so that helps. Pretty much every other Pro audio interface I've found is balanced, and seem to do well balanced. Unbalanced... Maybe the EMU doesn't suck that bad, but still...
The DBpro is designed to work well unbalanced.
As far as 75 Ohms doing awesome vs no-load, that's weird. Because for the same amount of voltage a 75 ohm load will demand more current than a 10k ohm load (which is "no-load"). So far I've not seen a situation where a no-load (open) will do worse than a loaded measurement.