Sometimes I will drop a small fly below a caddis or a hopper if I am fishing with a noob. But mostly if I fish two flies its a double scud rig with a drop shot or just two heavy bead head nymphs. If fishing a bugger usually only one fly. On crane sometimes a hopper dropper rig will work well on the fast drop offs and ledges as it will suspend the nymph long enough to hold it on the ledge for a second. Mostly just euro or drop shot style nymphing works best for me