OK - I can't help myself - time to throw my 2 pennies in.

Its been many years, but I remember the term "force couple" being used in applying torque to a system. There are several forces being applied to the boat. In addition to windage, wave forces, etc. there is the CG and the CB.

Regarding CB, assuming you have enough buoyancy in the mast not to go turtle, you end up in a stable position where the CG of the boat is nestled between the buoyancy forces of the mast and hull.

Regarding the CG, since we are on the boat, we are effectively part of it from a calculation standpoint. By using the righting line and leaning out we move our body mass such that the CG of the boat+person system moves outside the stable point between the two buoyancy forces. Once that happens you have a force couple (CB pushing up and CG pulling down) and the boat begins to rotate.

Again, the mass of our body is connected to the vessel both through the righting line and our feet so we are part of it. If we move the righting line far enough away from the CB we don't have to use our feet and as we dangle from it, the force on the rope is simply our weight. If we have a long enough (and strong enough) dagger or righting arm to stand on, we don't need a righting line, so rope force = zero. Key point is getting the CG of our body outward as far as possible so we move the CG of the boat+person system past the stability point between the hull+mast buoyancy.

By moving the rope attachment point down (toward the dolphin striker or below), the rope force on our hands goes up - presumably to infinity if the attachment point gets low enough. Moving the rope up or over the hull reduces the force, thus the intuitive feeling that there is better leverage. Neither of these make the boat right any faster <unless> due to strength limitation or other reason they allow you to get your body CG further outboard.