The emergers rise quickly and then spend a long time getting airborne compared the E. Pleuralis. Recall that E. Pleuralis is better prepared when it gets to the surface having gotten rid of the shuck earlier. An alternative is to fish a properly sized brown wet fly across and down, swinging it through likely water. If you do see surface activity, rather than use a dry fly, use a nymph tied on dry fly hook designed to float in the film. This is the form the trout more often attacks because it knows the little critter is likely to be there a while.
Nothing is more disconcerting to a trout than to have an insect fly away just before it inhales it.
The body of the floating nymph should be light brown to tan in color. I like tightly wrapped rabbit fur as a dubbing as it traps air and helps the nymph to float, even when a bit wet. Like most stone flies it crawls to the edge of the stream or a rock and sheds its shuck then flies off. Thus the emerger is not normally available to the trout. However, you will see the adults on the surface as they return to lay eggs the next day.