I have gotten skunked trying to match trico a couple of times this month. Not only was I unprepared, but also without the proper fly on hand. I did my best with a size 16 baetis dun, but it was simply awful. I got schooled by the picky fish. I visited a shop in Fergus and asked what's up and I picked up a couple of black body + white wing and light body + white wing tricos and they seem to work well. I also resorted to using really light 5x or 6x lines and a light 3W rod to make softer presentations.
I noticed that the fish were literally leaping out and above the surface to get the insects and it was mostly happening in flat water, either right after a riffle or before a riffle.
Both color variations worked fairly well.