Good advice from Norm .. just to elaborate a little if I may...
I would suggest that the top dropper be a 'bumble-palmer-zulu' type pattern or something similar heavily dressed palmer style.
Acting as an attractor the top dropper comes into it's own as the flies are drawn toward the angler raising the rod tip leading into the back cast -and the flies are literally just under the surface .
The top dropper creates a wake as it is drawn across the surface all be it perhaps for only a few feet.
Often trout will follow almost to your feet without a take.
Attracted by the wake and the water shallowing the fish turns and will take the middle dropper or tail fly.
Same principle as short lining from a boat.
Fan casting before taking a step ensures that all the water to your immediate front and flanks are covered.
Concentrate on drop offs,and the mouths of any burns or feeder streams that spill into the loch as well as the regular boulders and weed banks.
If all else fails fish a single polystickle or Jersey herd these small fry like patterns often produce the goods when the fishing is quiet,Bearing in mind that fly life can be quite limited in some of these peaty acidic waters.
JOHN
A GHILLIE'S TALE