Some fly fisherman showed me what was working when all the others were not getting a bite on any pattern.
He was using a Stimulator dry fly down deep. He also had a swivel which prevented the twisted so often associated with big flies trolled. So I tried it. Wow. I am now a fan of deep trolling really big flies both dry or wet. I use something called a steelhead fly pattern Jock Scott, Winters Hope, Black Dose, and some really big trout flies like the Stimulator, Kiwi Muddler Minnow, Really big Doc Sprately any color.
Strip out all your fly line ( sinking ) then 50 pulls of the backing and troll erratic, slow, then stop. Reel in slowly. Be ready any time you stop or make a wide turn. Post your results here. We need to know if this is then way of the troller in B.C. lakes. You will find me on Valentine or Horse doing this.