Voltage was measured at the red VOUT test point on the board, and before the amp meter and load.
I was looking at the first curve on P8, which shows the efficiency going up as the output voltage goes up. I was considering putting two of them in parallel, since our typical load is 9-10 amps. If the output current is limited to 5 amps, that would presumably keep the dissipation under control? The bigger problem is the regulation. I will try to find time to re-check in the next day or so.