Yes, I was trying to talk about the fact that kite vs wind speed is fairly constant (in a very simplified sense), so increasing kite looping radius would decrease the rotary speed of the shaft. You are right that this would also increase the lambda value of your design (more possible moment transfer through the shaft). Maybe these two effects would cancel each other out?
In my studies of this, I have figured that the kite looping diameter is more limited by how close you want the turbine to be to the ground… So a practical minimum ground clearance dictates shaft elevation angle and looping diameter, then the other parameters must be chosen to match well… finally optimize for maximum power output at the winds you are interested in .