Funny, I've had some of my best success, and certainly most enjoyable dry fly moments on the river prospecting with a Wulff in fast water - a great feeling to just have a hunch about where a fish may be rising only to have them strike violently on the first cast (and it always seems to be the first one if you present it OK). Also good advice on the HRO report is to move to emergers. I've been using size 22 BWO emergers as the uppermost fly on my nymph rig to some success, as well as as a dropper off a deer-hair BWO dry...only problem I've found with the dropper technique is I go through a bunch in a session using 6x as the trout seem to like to strike violently when I am roll casting out of the drift and break off instantly, regardless, the emerger certainly adds more to your drift and it seems like a little drag pulling the fly up can induce a solid strike.