For top water dries I use Uni thread furled leaders w/floro tippet w/ wf line (RIO)
For my nymphs I make my own Fluro carbon furled leaders, fluro tippets with wf floating line for fishing
Just sub surface to 3 feet deep. For deeper fishing nymphs I slip on the reel with an intermediate line
(Lake line from RIO) with the Fluro carbon furled leader w/ fluro tippets.
I have never experienced any problems and catch more than my share.
I do not sell them, only make for my own fishin.

Denny