Nymphs getting eaten have been #14-18 red lightning bugs, red copper johns in the same sizes, different caddis larva in shades of tan or green #16-18, green and tan soft hackles in similar sizes as well. Attractor nymphs(robo pheasant tails, prince nymphs) in sizes #14-16 up top with the smaller nymphs on bottom definitely do the trick. If you want try dropping a single nymph off of a big ugly foam hopper to cover both bases.
Stripping streamers always gets some sort of action. Try the standard black or olive matuka or wooly buggers for a different sort of strike. Streamers also seem to pull out the few large browns lingering around.