I use stimulators for my fall back flies. My biggest AuSable brown caught on a dry took a size 12 stimulator on the Mason Tract. I've ties a couple Borchers but, for some reason, haven't given them a try. Fishing up there a few weeks ago was an exercize in futility. Worst I've ever seen there. so I reveled in the beauty of the river system, and thanked the Lord for plastic kayaks replacing aluminum canoes!