Nicholas,
I loved the video! I only want to point out the correct meaning of this term to save you from an inadvertent misuse in an advertisement someday.
"Behind the power curve" means you're flying below the speed at which minimum power is required to fly. That probably is about 40 MPH (65 kph) for your machine. It doesn't mean it wont fly, it simply means that any additional slowing would require the addition of more power.
If you're using nearly full power at very low airspeed, you are definitely behind the power curve, in a big way. And, doing it very well, I might add! I can't wait to see your machines start showing up here. This is as close as anything I've seen to what could be done with a really light Bensen with 90 HP and a skilled pilot.