I used to find early the next morning you get a smaller rise of caenis and you can rise of few fish that will come to the fly properly, a small white cul de canard I found best, they were normally in close to the edge mopping up. There's nothing more frustrating than seeing fish rise everywhere that just ignore everything you try.
You could always try stripping a sedge pattern but being honest I've not done much good in the evening and I have tried all sorts, the fish get too preoccupied.