ne flyfissure,
I will not attempt to answer your question as it is written. I make my own Furled leaders and nymph fish 99% of the time and have no problems with the drag.
I think the most important thing we need, in order to answer your question accurately, is to know for sure if your question is in regard to a Braided leader or a Furled Leader because they both exist and a lot of people have tried Braided leaders and do not like them and they assume that a Furled leader is the same thing and it is not. There is a difference between them.
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.