With regard to "bumping" fish, when using the "New Zealand rig", this
is a lot worse when fishing for grayling, because of the way they rise
and take the fly. Indeed, I can´t remember hooking a single fish on
the dry while using it. I did try it for a while, but went back to
other methods after a season or so. I don´t use it for trout fishing
any more either.

As this sliding dry fly rig is "new", I don´t have much experience
with it, ( only half a grayling season), but it looks like becoming
one of my "go to" rigs for many situations.

Obviously, this rig is primarily designed to allow the nymph, soft
hackle, etc to fish at the right depth, but I still like to get the
fish that occasionally hit the dry fly. Otherwise, I might just as
well use a sliding indicator instead of a fly.

TL
MC