Instead of a strike indicator I like to use a grass hopper or a foam ant. That way it is also another hook in the water. Several times I have had trout hit an indicator instead of the fly. Google hopper dropper.
I had my own personal stocker fest this evening at a local pit. I forgot how much fun rainbows are. I was using a hopper dropper with a #18 pheasant tail on a 30" dropper. Also tried a bead head prince but nobody seemed to like it.