Wait, I though the regulator topology of the dna 200/250 series was buck-only?
If so, you can't get 9V out of it when run in 133/166 configuration with only 2 cells, where the input voltage maxes out at 8.4.
You are likely entirely correct. I was just pulling on brain tissue that remembers the ~9V spec on the 250 board without thinking about the number of cells. It has to be reduced in the 2 battery configuration, but it is not limited to 6.3(?)V like the 75 is.