The brookies were all in one of 2 places today. They were either tight up under rocks or staged at the lower end of the holes just hoping something will drift through. When casting to these small clear holes, you have to get down low and make a nice precise cast. Drop that fly where you want it the 1st time. Too many false casts or poor casts will just ruin a hole in these conditions. The best fish I caught today were from blind casts around the backsides of rocks.
With wild brownies in PA, there is a lot to be said for matching the hatch. For brookies, in my experience, not so much. I find myself resorting to the Royal Wulff most of the time. I tried numerous other dries and a few terrestrials today and they all worked. I'll tell you what works about those Royal Wulffs (or Royal Coachman for that matter) for me, now that I've eclipsed 40...I can't see some flies on the water very well. I can always see that white parachute on those flies.
Keep at it and tight lines!