There were a "couple" "moments" in my life when I did get "torqued"! : )
I twist both legs to the 10% and allow the leader to furl and the leader works great so I see no reason to twist them any further than the 10%. I am not sure what you would gain from twisting beyond 10%. I would think one could twist too far and the leader would kink up "big time" when you do an steady pull to free up a snagged fly and it either breaks off or comes lose. Just a thought with nothing to back it up except "horse sense".
Interesting question.....
Warren
Fly fishing and fly tying are two things that I do, and when I am doing them, they are the only 2 things I think about. They clear my mind.