nice to hear that you can fly under 10 kn. The Differenz to me, and some of the nice people here is, you are a with your weight in a top position to us😂 and 7.7 is not an small Sail. I think you have an Wind that is smooth evenly. I think, is the wind like this, you can generate power as you described.
Question: where are your straps? I have all outside, front and rear. When I’m flying this is for me the best position. I can‘t imagine pumping with my back foot in the strap (pressure on the tail). But as soon I have 8 kg less and steady wind, I will try it 😎