Ally~
I wouldnt say its not fishing well at present ? I fished two, 4 hrs tickets there in the last three weeks took 5 fish of a possible 6

The water is pretty coloured right now always is when we had a lot of run off surface water, so probably bright /dark flys lures just to help the fish see. And id keep it slow
Normally yellow dancer does very well also mini cats, black buzzers, hares ear nymphs, damsel nymphs, orange frizt, most gold heads to be honest. Oh Viva dancer (black hackle yellow tail) took alot of fish for me there this time last year.
I always use a floating line and fish nymphs

on a long leader say 15'-18ft
Have fun, i like the fact they dont do C & R and my fish alway have lovely full tails
Englander