I have the manual on it and that was a governor ajustment .only other ajustment is the fuel rail stop, so you can set minimum engine rpm.
Nice to see you got it figured out. I'm wondering if your adjusting the governor or the fuel rack? Didn't think the governor would increase the fuel flow, only the they high speed setting.
Thinking about it, really thats the only way you could increase power load is to feed it more fuel :-)