Thanks for the updates Jeremy.
I wonder if the print temp was too high on the Ultimaker, Electrifi lists an increase in resistivity as the print temperature increases. They claim around 0.04ohm-cm at 150C and 0.045ohm-cm at 180C. I'm not sure how accurate the latter value is. Id be worried about oxidation at >150C, I wonder what other people think.
I'm going to give the Electrifi a shot on a lulzbot mini in the near future.