The action would turn on and off for the grayling. We caught a few using a mickey finn on an ultralight rod with a split shot. I then broke out a 18 foot pole (as in no reel) that my father in law sent me from Japan.
Tied on a size 10 prince nymph a small split shot, a large indicator and gave it a go. Worked great! I did hit a small rainbow and a good sized grayling and both tested the rod. Not sure what I am going to do with a 18 inch rainbow. I think I need to step down to 2lbs or 1 lbs test to save the rod in case of a big fish. I was using 4 pounds.