all the righting force mush come via the righting line. So, if it were true that the righting line angle did not matter then you should be able to tie the righting line to the lower beam right next to the bottom hull and still be able right the boat.
No.. All the righting force comes from the sailor weight. The line and his feet only help him keep his position, as far out as possible. If the line is attached lower, near the bottom hull it turns harder and harder for him to keep in place, that's all. The righting moment doesn't change as long as he's able to hold on
