For sussing out where the fish are (with respect to their movement from winter/cold water deeper lies towards their warmer temperature broken fast water lies) I would start off with a trio rig. This will allow you to use a substantial (i.e. really quite effing heavy - a 3.3 or even 3.8mm tungsten bead head hare's ear or PTN) point fly about 4 feet below a super buoyant dry fly. The dropper can then be a waterhen bloa (14's and 12's are actually OK when the large dark olives are about) or a small (16's) flashback ptn.
The advantage of this is that you are covering 3 layers of water at all times and that the same rig can be used to work your way up from the deeper runs up the shelf of the riffles into shallower water (as the depth decreases, the current speed increases - allowing you to often keep the same point fly)
Notice where you get takes and then apply your favoured technique to the same types of water further up the river (or keep using the trio if you enjoy it).
Dropper nymph here:
Durable "Mary" PTN variant
Dry fly here (in post number 5):
NZ style quiery