I thought you might have one of the hip mounted side scan fish finder radars, like some affluent anglers (not me) are purported to have.
This way you only fish the pools which have fish, a novel idea !
Good luck, just don't give up, think of all the great exercise and fresh air you are getting flinging the spey equipment. Good upper body work out. Might want to try the scottish mouth wash for luck also during the day.
P.S. Dark nymphs drifted deep and slow