But it does, doesn't it? By the width of the hull?
Because there would be only small frictional losses as the rope runs over the hull most of your downward force would be at the boats maximum width. I would also suggest that you have moved your rotational force closer to its apex.
What I'm trying to say is that when you go Hawaiian your attachment point has to rise further off the water in order for the mast to come to horizontal. This is while you are pulling down on it. With over-the-hull I imagine it as describing a more lateral movement as the hull works as a pulley.
No, the only things that matter are the centre of gravity of the boat, the sailor and the centre of buoyancy. All of them are not affect by the attachment of the line.
My other thought, looking at your diagram is that the Over-the-hull method produces more direct downforce whilst the Hawaiian puts more weight/force onto the soles of your righters feet. Move the righting line to below the dolphin striker. A lot of force on the line and your legs but how much into righting the boat?
Yes, the force in the line increase, up to the point where you simply cant hold anymore. If you can hook to the trapez it is ok, but in some cases the line under the tramp is not long enough to hook to the trapez.
If you are at the lower end of the possible weight range to right the boat, the over the hull method is definetly the way to go.