I'm not sure where in PA you're located, but over here in the Southwestern part I've had tremendous success with the stimulator. In fact the largest trout I've ever caught was on a Royal Stimulator. At first I only fished them in smaller sizes - #16 & #18, but then I realized they work exceptionally well for a hopper pattern in the larger sizes. I like to tie them with a Pearl or Rootbeer Crystal Flash underwing. So my advice is to not be afraid of the larger sizes, especially later in the season - July, August, September.
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"If we carry purism to it's logical conclusion, to do it right you'd have to live naked in a cave, hit your trout on the head with rocks, and eat them raw. But, so as not to violate another essential element of the fly-fishing tradition, the rocks would have to be quarried in England and cost $300 each."
~John Gierach
My one wish is that when I die my wife doesn't sell my fishing stuff for what I told her I paid for it...