I have used righting poles and ropes here are definate facts I made my first righting pole too short and it didn't work, I made a longer one and it worked. Its just a lever it has to work the only limitation is how far you get from the pivot point. Further out the more leveredge. I have used righting ropes on many cats, the under tramp system is neat and great when it works but if you can't get your cat back up throw the rope over the hulls like I did and you will never go back to an under tramp system. The reason over hull system works is you are adding more height to your leveredge by pulling the object from higher thereby increasing the leveredge on the object. When you pull a tree over you don't tie your rope around the middle you tie it around the top
I understand how clingy this idea is but it's just not true. I have a degree in this. It makes it easier to hold on to the rope but will not give you more mechanical advantage to right the boat because you and the boat are essentially a "closed system". You are attached to the boat at every point - your feet, your arms, the rope. The only thing that affects the physics of righting the boat is how far you extend your weight from the center of rotation (the hull in the water). You move your weight out to move the center of gravity for the system (you, the boat, the lift of the sails) past the pivot point to the underside of the boat so it will start to rotate and right itself.