RE: How to calculate line pull
Yeah, there is a lot more aerodynamic things that affect the line pull we feel.
Years back, Al Rabe popularized the movable rudder for CL aerobatics airplanes. It moved BOTH WAYS. Yes, it actually yawed the model into and out of the circle. It worked both ways too.
There are gyroscopic precession and p-effect, a couple of aerodynamic things that affect airplanes that are pitching up or down, that affect models too. They're airplanes after all.
His rudder moved with the other surfaces to increase tension when the aero was decreasing and to decrease when it was increasing.
Just mentioned it because it shows how sensitive our CL models are to the aero effects and the trim of the model.