In article , PRM
wrote:

If you do have to deal with these situations, go long, realizing that
it may not look pretty but it will work. BTW, make sure to cast far enough
upstream to let the "kinks" in the "clump" of the leader to work itself out
before passing over the strike area.

Many years ago I had casting lessons from the Hardy professional, Andy
Murray. One of the things he taught me for dryfly upstream casting on
glassy water is to give your rod a good sideways wiggle as the line is
flying out. If you get the timing right on this it will lay your tippet
in a zig-zag pattern that will straighten as the stream pulls at it,
but will leave the fly un-dragged.

Lazarus